Q 1. Metals lose electrons from their lattice to become ……….
A. Positive ions B. Negative ions
C. Alkalies D. Non-metals
Answer: - Option A
Explanation: - Metal losses electrons and become positive charged ion.
Q 2. Dative Covalent bond is found in ………
A. Ammonia B. Ammonium ion
C. Urea D. Nitrogen
Answer: - Option B
Explanation: - Ammonium ion contains dative bond (NH4+)
Q 3. Charge on any ion depends upon gain or loss of ………
A. Electrons B. Protons
C. Neutrons D. Nucleons
Answer: - Option A
Explanation: - When an atom losses or gains electrons, it will convert into charged ions.
Q 4. Metals and Non- metals combine to give electronic configuration of ……….
A. Alkalies B. Noble gases
C. Metalloids D. Acids
Answer: - Option B
Explanation: - When metals and non- metals loss and gain electrons respectively, their electronic configuration will become as noble gases.
Q 5. Noble gases exist as ……………
A. Monoatomic B. Diatomic
C. Polyatomic D. None of these
Answer: - Option A
Explanation: - Noble gases are stable so they exist as monoatomic.
Q 6. When magnesium reacts with oxygen, nature of the bond formed is ……….
A. Ionic B. Covalent
C. Metallic D. Dative
Answer: - Option A
Explanation: - Magnesium Oxide (MgO) has ionic bond.
Q 7. Metals are good conductors due to ………
A. Ionic lattice B. Crystalline lumps
C. Mostly solids D. Delocalized electrons.
Answer: - Option D
Explanation: - Metals are good conductors due to delocalized electrons means moving electrons.
Q 8. When a covalent bond is formed between hydrogen atom and a very electronegative atom, then it is known as……
A. Ionic bond B. Hydrogen bond
C. Co-ordinate bond D. All of the above
Answer: - Option B
Explanation: - Bond formed between hydrogen and very electronegative atom (O, N, F) is known as hydrogen bonding
Q.9. Molecules which have permanent dipole are known as………
A. Polar B. Dipole
C. Non-polar D. Tripolar
Answer: - Option A
Explanation: - Molecules which have permanent dipole are known as polar like H-Cl, H-F
Q 10. Electrovalent bond is another name of ………….
A. Metallic bond B. Covalent bond
C. Ionic bond D. Co-ordinate bond
Answer: - Option C
Explanation: - Electrovalent bond is another name of Ionic bond.
11. Covalent compounds are …………….
A. Good conductors of electricity B. Non-conductors of electricity
C. Poor conductors of electricity D. None of the above
Answer: - Option B
Explanation: - Covalent compounds don't split into ions when dissolved due that covalent compounds are non-conductors of electricity.
12. Crystal lattice is actually …………
A. Sum of points B. Array of points
C. Lines of points D. triangles of points
Answer: - Option A
Explanation: - Crystal lattice is array of points due to the ordered internal arrangement of atoms in a crystal structure
13. Unit cell is the smallest building unit of ………………
A. Crystal lattice B. Liquids
C. Gases D. None of the above
Answer: - Option A
Explanation: - Unit cell is the smallest building unit of crystal lattice.
14. Which of the following is an amorphous solid?
A. Diamond B. Glass
C. Sodium chloride D. None of the above
Answer: - Option B
Explanation: - Glass is an amorphous solid because Silicon dioxide molecules are not packed in a crystal lattice
The co-ordinate number of FCC structure is…………..
A. 4 B. 8
C. 2 D.12
Answer: - Option 12B
1. Explanation: - FCC coordination number is 12. Coordination number is the number of atoms or ions immediately surrounding a central atom in a complex or crystal.
The lattice site in a pure crystal cannot be occupied by ……………
A. Molecule B. Ion
C. Electron D. Atom
Answer: - Option C
Explanation: - The lattice site in a pure crystal can be occupied by molecule, ion or atom.
Substance which alter the rate of chemical reaction without undergoing any chemical change are called as ………
A. Polymers B. catalysts
C. Products D. None of the above
Answer: - Option B
Explanation: - Substance which alter the rate of chemical reaction without undergoing any chemical change are called as catalysts.
The substance that reduce the effectiveness of a catalyst are called ………
A. Promoters B. Autocatalysts
C. Inhibitors D. None of the above.
Answer: - Option C
Explanation: - The substance that reduce the effectiveness of a catalyst are called inhibitors.
When catalyst and reactant are in the same phase then it is called…….
A. Heterogenous catalysis B. Homogenous catalysis
C. Autocatalysis D. None of these
Answer: - Option B
Explanation: - When catalyst and reactant are in the same phase then it is called homogenous catalysis.
When a product acts as a catalyst then it is called as ……….
A. Self-catalysis B. Positive catalysis
C. Autocatalysis D. Negative catalysis
Answer: - Option C
Explanation: - Single chemical reaction is said to be autocatalytic if one of the reaction products is also a catalyst for the same or a coupled reaction.
Complete transfer of one or more electrons between atoms constituting in forming…………
A. Ionic Bond B. Covalent bond
C. Co-ordinate Bond D. Dative Bond
Answer: - Option A
Explanation: - Ionic bond is formed by complete transfer of one or more electrons.
When a single atom provides both electrons which are needed for completion of covalent bond then it leads to……
A. Ionic Bond B. Covalent bond
C. Co-ordinate Bond D. None
Answer: - Option C
Explanation: - A coordinate bond (also called a dative covalent bond) is a covalent bond (a shared pair of electrons) in which both electrons come from the same atom.
In ammonia ion, electrons required between hydrogen ion and nitrogen ion are…………
A. 1 B. 2
C. 3 D. 4
Answer: - Option B
Explanation: - In ammonia ion, electrons required between hydrogen ion and nitrogen ion are 2.
Pairs of outer shell electrons not used in bonding are called as………
A. Valence electrons B. Donor electrons
C. Electrovalent electrons D. Lone pairs
Answer: - Option D
Explanation: - A lone pair is an electron pair in the outermost shell of an atom that is not shared or bonded to another atom.
Bond formed by sharing of four electrons is called as……………….
A. Covalent bond B. Electrovalent bond
C. Dative covalent bond D. Double covalent bond
Answer: - Option D
Explanation: - Bond formed by sharing of four electrons is called as double covalent bond. (E.g. O2, CO)
For dative covalent bonding, one atom having a lone pair of electrons combines with …
A. An electron deficient compound B. An expanded octet
C. A proton of other atom D. A neutron of other atom
Answer: - Option A
Explanation: - For dative covalent bonding, one atom having a lone pair of electrons combines with an electron deficient compound.
When the bond is formed by sharing of two pairs of electrons by atoms, then the bond is called as……..
A. Single covalent bond B. Double covalent bond
C. Triple covalent bond D. Ionic bond
Answer: - Option B
Explanation: - When the bond is formed by sharing of two pairs of electrons by atoms, then the bond is called as double covalent bond. (E.g. O2, CO)
Neither ions nor electrons are free to move in………………
A. Liquids B. Metals
C. Ionic solids D. All of the above
Answer: - Option C
Explanation: - Neither ions nor electrons are free to move in ionic solids.
Weak forces between molecules are called as………………………
A. Molecular forces B. Intermolecular forces
C. Intramolecular forces D. Extramolecular forces
Answer: - Option B
Explanation: - Weak forces between molecules are called as Intermolecular forces.
Electrons are usually lost by…………………………….
A. Metals B. Non-metals
C. Inert gases D. All of the above
Answer: - Option A
Explanation: - Electrons are usually lost by Metal.
In nitrogen molecule, numbers of electrons required by each nitrogen atom in outer shell are……………..
A. 1 B. 2
C. 3 D. 4
Answer: - Option C
Explanation: - Nitrogen atom has electronic configuration like (2, 5). So numbers of electrons required by each nitrogen atom in outer shell are 3.
Conduction of electricity in metallic bonding is due to the presence of……………
A. Protons B. Lattice
C. Delocalized electrons D. Nucleus
Answer: - Option C
Explanation: - Conduction of electricity in metallic bonding is due to the presence of delocalized electrons.
Metal atoms……………………
A. Lose their outer electrons B. Become positively charged
C. Become negatively charged D. Both (A) & (B)
Answer: - Option D
Explanation: - Metal losses electrons and become positive charged ion.
Nitrogen molecule is an example of ………………………….
A. Single covalent bond B. Double covalent bond
C. Triple covalent bond D. Single co-ordinate bond
Answer: - Option C
Explanation: - Nitrogen molecule is formed by sharing of three electron pairs.
Regular arrangement in which atoms are closely packed together is called a ……
A. Tetrahedral structure B. Lattice
C. Crystal lattice D. Ionic bond
Answer: - Option C
Explanation: - Regular arrangement in which atoms are closely packed together is called a Crystal lattice.
Resulting a loss of electrons forms …………………………………
A. Anodes B. Cathodes
C. Negative ions D. Positive ions
Answer: - Option D
Explanation: - When an atom losses electrons form positive ions.
Representation of bond by single, double or triple line is done in…………………
A. Metallic bond B. Co-ordinate bond
C. Covalent bond D. Ionic bond
Answer: - Option C
Explanation: - Covalent bonding has three types of bonding like single ,double & triple covalent bond.
Which of the following characteristic does not possess by the metal?
A. Luster B. Ductility
C. Increase in conductance by increase in temperature D. Malleability
Answer: - Option C
Explanation: - Increase in conductance by increase in temperature. For metals, the thermal conductivity is mainly a function of the motion of free electrons.
On which factor, conductance of metals is responsible?
A. Ions B. Delocalized electrons
C. Atomic kernel D. Number of atoms
Answer: - Option B
Explanation: - For metals, the thermal conductivity is mainly a function of the motion of free electrons i.e. delocalized electrons.
The difference between the number of atoms in a unit cell of a BCC crystal and an FCC crystal is ………….
A. 1 B. 2
C. 4 D. 6
Answer: - Option B
Explanation: - The number of atoms in a unit cell of a BCC crystal is 2 and an FCC crystal is 4. So the difference between two is 2.
When partial positive end of one molecule is attracted weakly to partial negative end , then the force between them is…………………….
A. Electrostatic force B. Dipole – dipole interaction
C. Ionic bond D. None of the above
Answer: - Option B
Explanation: - partial positive end of one molecule is attracted weakly to partial negative end , then the force between them is dipole – dipole interaction
Tendency of atoms to acquire eight electrons in their valence shell is…………. …
A. Octet rule B. Duplet rule
C. Triplet rule D. All of the above
Answer: - Option A
Explanation: - Tendency of atoms to acquire eight electrons in their valence shell or last orbit is octet rule.
E.g. Mg Mg ++ + 2e- (2 , 8, 2) (2 , 8)
In the formation of Mg++ ion. Which one is the correct reaction in the following?
A. Mg → Mg++ + 4e- B. Mg → Mg++ + 2e-
C. Mg → Mg++ + 3e- D. Mg → Mg++ + 1e-
Answer: - Option B
Explanation: - Mg Mg ++ + 2e-
(2 , 8, 2) (2 , 8)
What type of bond form between hydrogen & oxygen atom in the given structure?
A . Hydrogen Bond B. Metallic Bond
C. Non-metallic Bond D. Oxygen Bond
Answer: - Option A
Explanation: - The hydrogen bond is an attractive interaction between a hydrogen atom from a molecule or a molecular fragment X–H in which X is more electronegative atom like O, N, F.
The given figure represents
A. Non-Metal sea model B. Cation sea model
C. Electron sea model D. Bohr’s atomic model
Answer: - Option C
Explanation: - The electron sea model is a model of metallic bonding in which cations (positive-charged metal ions) are considered to be fixed points within a mobile 'sea' of electrons.
What type of interaction between δ+ & δ- ?
A. Positive negative B. Chargeable
C. Dipole-dipole D. Equal
Answer: - Option C
Explanation: - Two hydrogen chloride molecules displaying dipole-dipole interaction The relatively negative chlorine atom is attracted to the relatively positive hydrogen atom.
The catalyst used in the lead chamber process of sulphuric acid manufacturing
A. Platinum B. Oxide of nitrogen
C. Nickel D. Vanadium compound
Answer: - Option B
Explanation: - Lead-chamber Process, method of producing sulfuric acid by oxidizing sulfur dioxide with moist air, using gaseous nitrogen oxides as catalysts, the reaction taking place primarily in a series of large, boxlike chambers of sheet lead.
An example of autocatalytic reaction is …
A. The decomposition of nitroglycerine B. Thermal decomposition of KClO3 & MnO2 mixture
C. Break down of 6C14 D. Hydrogenation of vegetable oil using nickel catalysts
Answer: - Option A
Explanation: - N2 is one of the product of decomposition of nitroglycerine plays the role of an autocatalyst.
The coordination number of a metal crystallizing in a hexagonal close packing (HCP) structure is
A. 6 B. 7
C. 8 D. 12
Answer: - Option D
Explanation: - The number of the nearest atoms surrounded by an atom is called the coordination number of that lattice. The coordination number of the hexagonal close-packed structure is 12.
Which of the following compound possesses covalent bond?
A. CaCl2 B. BaCl2
C. AlCl3 D. H2O
Answer: - Option D
Explanation: - H2O has single covalent bond
Proton accelerate the hydrolysis of ester. This is an example of ………
A. A Heterogenous catalysis B. An acid-base catalysis
C. A promoter D. A negative catalyst
Answer: - Option B
Explanation: - In hydrolysis of ester, acid forms and hydrogen ion (proton) acts as a catalyst. So, this is a example of acid-base catalyst.
Which of the following processes does not involve a catalyst?
A. Haber’s process B. Thermite process
C. Ostwald process D. Contact process
Answer: - Option B
Explanation: - The Thermite Process or Goldschmidt Process is the method of obtaining liquid metal by reduction of the oxide with aluminium powder, when ignited with magnesium ribbon it reacts by producing iron and aluminium oxide at an intensely high temperature approaching 3000oC. The reducing agent is aluminium.
Which of the following reaction is catalysed by enzyme maltase?
A. Starch to maltose B. Maltose to Glucose
C. Lactose to maltose D. Maltose to glucose + Fructose
Answer: - Option B
Explanation: - The enzyme which converts maltose to glucose is maltase.
The transition metal used as a catalyst is…..
A. Nickel B. Platinum
C. Cobalt D. All of these
Answer: - Option D
Explanation: - The transition metals used as a catalyst are Ni, Co, Pt, Cd etc
In the Ostwald’s process for the manufacture of HNO3, the catalyst used is……
A. Mo B. Fe
C. Ni D. Pt
Answer: - Option D
Explanation: - In the Ostwald’s process for the manufacture of HNO3, the catalyst used is Pt.
Adam’s catalyst is …
A. Platinum B. Iron
C. Molybdenum D. Nickel
Answer: - Option A
Explanation: - Adam’s catalyst, also known as platinum dioxide, is usually represented as Platinum(IV) oxide hydrate, PtO2•H2O.
Which of the following is not a category of catalysis?
A. Homogeneous B. Heterogeneous
C. Artificial D. Enzymatic
Answer: - Option C
Explanation: - Homogeneous, Heterogeneous and Enzymatic are categories of catalysis.
Which of the following is an example of homogeneous catalysis ?
A. Enzyme catalysis B. Hardening of animal and vegetable oils
C. Haber’s process D. Cracking of heavy oils for synthesis of gasoline
Answer: - Option A
Explanation: - Enzymes are homogeneous catalysts since they have to be in the same state as that of the reactants in order to mix well and speed up the decomposition of the biomolecule.
Which of the following statement is incorrect about the adsorption theory?
A. The catalyst is more efficient in finely divided state B. Action of promoters is not explained
C. Enhanced activity of a rough surface catalyst is explained D. Specific action of catalyst is explained
Answer: - Option B
Explanation: - Action of promoter is not related to the adsorption theory.
Which of the following process used for preparation of sulphuric acid?
A. Ostwald;s process B. Bergius process
C. Deacon’s process D. Chamber process
Answer: - Option D
Explanation: - Both Chamber process and Contact process are used for preparation of sulphuric acid.
Select the catalyst which is used for manufacturing of ethanol from glucose
A. Maltose B. Pt/V2O5
C. Zymase D. Fe2O3
Answer: - Option C
Explanation: - Glucose is converted to ethanol by the action of yeast Zymase.
Which of the following process is used for the preparation of Chlorine gas?
A. Deacon’s process B. Bergius process
C. Ostwald’s process D. Haber’s process
Answer: - Option A
Explanation: - Preparation of chlorine in Deacon's process: Atmospheric oxygen oxidizes HCl gas in presence of cupric chloride catalyst to form chlorine. Temperature is 723 K.
4Cl + O2 CuCl2 2Cl2 + 2H2O
Name the catalyst which is used For manufacture of glucose from cane sugar.
A. Maltase B. Zymase
C.CuCl2 D. CuCl
Answer: - Option A
Explanation: - Glucose is converted to cane sugar by the action of maltase.
Name the metal which increase the activity of iron metal when added in small amount.
A. Cu B. Mo
C. Al D. Mn
Answer: - Option B
Explanation: - Mo increases the activity of iron metal when added in small amount.
What is the role of Mo in following reaction:
A. Catalytic inhibitor B. Catalytic promoter
C. Catalyst D. Auto catalyst
Answer: - Option B
Explanation: - Ammonia industrially synthesized by the Haber-Bosch process from nitrogen gas and hydrogen gas in the presence of an iron-based catalyst. Electron transfer was taking place between two molybdenum atoms linked by a nitrogen molecule. Here Mo acts as catalytic promoter.
The adsorption theory is applicable to …
A. Homogeneous catalysis B. Heterogeneous catalysis
C. Catalysis D. None of the above
Answer: - Option B
Explanation: - Adsorption theory is applicable for solid catalysts which show heterogeneous catalysis. According to this theory, the gaseous reactants are adsorbed in the surface of the solid catalyst.
Water accumulates in cells of animals and plants due to presence of …
A. Covalent bond B. Co-ordinate bond
C. Hydrogen bond D. Electrovalent bond
Answer: - Option C
Explanation: - Water accumulates in cells of animals and plants due to presence of Hydrogen bond.
Solid CO2 is an example of…….
A. Molecular crystal B. Ionic crystal
C. Covalent crystal D. Metallic crystal
Answer: - Option A
Explanation: - Solid CO2 is an example of Molecular crystal. They have relatively weak intermolecular binding.
Which of the following is Amorphous?
A. Polystyrene B. Table salt
C. Silica D. Diamond
Answer: - Option C
Explanation: - The amorphous form of silica has been used as a photovoltaic solar cell because this is lightweight & flexible.
The property of crystalline solid is not
A. Anisotropic B. Isotropic
C. Hard D. Dense
Answer: - Option B
Explanation: Isotropic materials are materials whose properties remain the same when tested in different directions. The crystalline solids are anisotropic in nature, this means that the physical properties do change with the change in direction.
Characteristics features of solids are
A. Definite shape B. Definite size
C. Definite shape and size D. definite shape and rigidity
Answer: - Option D
Explanation: - Definite shape and rigidity are the characteristics features of solids.
Diamond is an example of
A. Solid with hydrogen bonding B. Electrovalent solid
C. Covalent solid D. Glass
Answer: - Option C
Explanation: - Diamond is a covalent solid and yet has a high melting point mainly due to its interlinked structure.
Which solid will have the weakest inter molecular forces?
A. Ice B. Phosphorus
C. Naphthalene D. Sodium Fluoride
Answer: - Option A
Explanation: - Ice has the lowest melting point out of the given solids , hence it has the weakest intermolecular forces.
Which of the following example of metallic crystal solid
A. C B. Si
C. W D. AgCl
Answer: - Option A
Explanation: - Metallic crystals consists of metal cations surrounded by large number of mobile valence electrons, these electrons are also known as delocalised electrons, which do not belong to any one atom, but are capable of moving through the crystal. As a result metallic crystals are good conductors of electricity. E.g. Au, W etc
Lead is a metallic crystal having a structure.
A. FCC B. BCC
C. HCP D. TCP
Answer: - Option A
Explanation: - Crystalline solids are classified as either metallic or non-metallic. Pb, along with Cu, Ag, Al, and Ni, has a face-centered cubic structure.
Which of the following has a HCP crystal structure?
A. W B. Mo
C. Cr D. Zr
Answer: - Option D
Explanation: - Crystalline solids are classified as either metallic or non-metallic. W, Mo, and Cr are examples of the body-centered cubic structure of crystals. The HCP structure is found in Mg, Zn, Ti, Cd, Zr, and others.
Amorphous solids have structure.
A. Regular B. Linear
C. Irregular D. Dendritic
Answer: - Option C
Explanation: - Materials in which the molecule is the basic structural solid and has an irregular structure is known as amorphous solid. Crystalline solids, on the other hand, usually are arranged in a regular manner.
Bravais lattice consists of space lattices.
A. Eleven B. Twelve
C. Thirteen D. Fourteen
Answer: - Option D
Explanation: - Materials in which the molecule is the basic structural solid and has an irregular structure is known as amorphous solid. Crystalline solids, on the other hand, usually are arranged in a regular manner.
Identify the lattice structure of given unit cell;
A. SCC B. BCC
C. FCC D. HCP
Answer: - Option B
Explanation: - Some metals crystallize in an arrangement that has a cubic unit cell with atoms at all of the corners and an atom in the center, This is called a body-centered cubic (BCC) solid.
Identify the lattice structure of given unit cell;
A. SCC B. BCC
C. FCC D. HCP
Answer: - Option C
Explanation: - Metal crystallize in an arrangement that has a cubic unit cell with atoms at all of the corners and at the centers of each face, This arrangement is called a face-centered cubic (FCC) solid.
Identify the lattice structure of given unit cell;
A. SCC B. BCC
C. FCC D. HCP
Answer: - Option A
Explanation: - In a simple cubic lattice, the unit cell that repeats in all directions is a cube defined by the centers of eight atoms.
The coordination number of a metal crystal in a Simple Cubic (SC) structure is
A. 6 B. 7
C. 8 D. 12
Answer: - Option A
Explanation: - The number of the nearest atoms surrounded by an atom is called the coordination number of that lattice. The coordination number of the simple cubic structure is 6.
The coordination number of a metal crystal in a Body centered cubic (BCC) structure is
A. 6 B. 7
C. 8 D. 12
Answer: - Option C
Explanation: - The number of the nearest atoms surrounded by an atom is called the coordination number of that lattice. The coordination number of the body centered cubic structure is 8.
05 – METAL CORROSION, ITS PREVENTION AND
ELECTROCHEMISTRY
The metal which is commonly used as a coating metal during electroplating of imitation jewellry is
A. Silver B. Gold
C. Alluminium D. Rhodium
Answer: - Option D
Explanation: - Rhodium is often used to give a good white colour to white gold jewellery (which is often not a good white colour) or is used selectively on yellow gold jewellery to give local areas of whiteness.
The process due to which water splits into hydrogen ions and hydroxyl ions is
A.Tinning B. Galvanizing
C. Electrolysis D. Ionization
Answer: - Option D
Explanation: - Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons.
The method of electrolysis which is used to improve corrosion resistance of any metal
A. Oxidation B. Electroplating
C. Tinning D. Redox reaction
Answer: - Option B
Explanation: - Electroplating is mainly done for avoiding corrosion of metals and for decorative purposes.
During electro refining of blister copper, anode and cathode respectively made up of
A. Pure Zn and impure Zn B. Impure Cu and pure Cu
C. Pure Mg and impure Mg D. Pure Cu and impure Cu
Answer: - Option B
Explanation: - During electro refining of blister copper, anode and cathode respectively made up of Impure Cu and pure Cu.
Which type of oxide film is formed on the surface of alkali and alkaline earth metal?
A. Unstable oxide film B. Non porous oxide film
C. Porous oxide film D. Volatile oxide film
Answer: - Option C
Explanation: - Porous oxide film is formed on the surface of alkali and alkaline earth metal like beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
Identify the substance, which form physical barrier between metal and corroding medium and reduce the corrosion
A. Promoters B. Semipermeable membrane
C. Inhibitors D. Salt bridge
Answer: - Option C
Explanation: - A corrosion inhibitor is a chemical compound that, when added to a liquid or gas, decreases the corrosion rate of a material, typically a metal or an alloy that comes into contact with the fluid.
The process used for repairing broken or worn out parts of machine is called
A. Electroplating B. Electro refining
C. Electrometallurgy D. Tinning
Answer: - Option A
Explanation: - The process used for repairing broken or worn out parts of machine is called electroplating.
The organic or inorganic substances, which when added in small quantity to the corrosive environment, effectively minimize the corrosion of metal are called as
A. Inhibitor B. Negative catalyst
C. Promoter D. None of the above
Answer: - Option A
Explanation: - The organic or inorganic substances, which when added in small quantity to the corrosive environment, effectively minimize the corrosion of metal are called as Inhibitor.
On which part of any metal, differential aeration type of corrosion will occur
A. More oxygenated part B. Less oxygenated part
C. Both A and B D. None of the above
Answer: - Option B
Explanation: - Less oxygenated part acts as anode due to that differential aeration type of corrosion occur at anodic area.
Electro chemical equivalent of a metal is Y gm/coulomb. The equivalent weight of a metal is
A. Y/96500 B. Y+96500
C. 96500/Y D. 96500*Y
Answer: - Option D
Explanation: - Equivalent weight = 96500* Electro chemical equivalent
Name the type of corrosion in the given situation copper sheets joint by iron nails and is exposed to humid environment
A. Atmospheric corrosion B. Immersed corrosion
C. Both A and B D. None of the above
Answer: - Option B
Explanation: - Immersion corrosion is a simple method of determining the rate of corrosion in aqueous solutions.
In electrochemical cells two half cells are in contact with each other by
A. Salt bridge B. Water bath
C. Sand bath D. None of the above
Answer: - Option A
Explanation: - The main function of a salt bridge is to help maintain the electrical neutrality within the internal circuit. It also helps in preventing the cell from taking its reaction to equilibrium.
In Zn/Zn++//Cu++/Cu cell, electrical energy is generated at the cost of
A. Electrical energy B. Thermal energy
C. Chemical energy D. Potential energy
Answer: - Option C
Explanation: - In a galvanic cell electrical energy is generated at the expense of chemical energy.
One of the method of preventing corrosion of metal by applying protective coating is
A. Electro metallurgy B. Fusion
C. Electroplating D. Electro refining
Answer: - Option C
Explanation: - Electroplating is usually used to cover a less expensive metal with a more expensive metal, or to cover a corrosive metal with a less corrosive or noncorrosive metal.
Select the volatile oxide film from the given option
A. FeCl3 B. AlCl3
C. MoO3 D. None of the above
Answer: - Option C
Explanation: - The volatile oxide film is MoO3
Tin coated metal can be used for
A. Cutlery B. Food industries
C. Machine preparation D. None of the above
Answer: - Option B
Explanation: - Tin metal dose not form any poisonous compound with acidic food content hence it is used for food industries.
Aqueous CuSO4 solution conducts electricity due to presence of
A. Crystals B. Atoms
C. Ions D. Salts
Answer: - Option C
Explanation: - In aqueous CuSO4 solution, CuSO4 splits into charged ions. Ions are responsible for the conductance of electricity.
The process of decomposition of electrolyte in presence of electric current is called
A. Electroplating B. Galvanizing
C. Electro refining D. Electrolysis
Answer: - Option D
Explanation: - The process of decomposition of electrolyte in presence of electric current is called electrolysis.
The aluminum metal is corrosion resistance because of formation of oxide film which is
A. Volatile B. Unstable
C. Porous D. Non porous
Answer: - Option D
Explanation: - The aluminum metal forms non porous oxide film which stops further corrosion.
The best suitable alloying metal for iron or steel in cutlery is
A. Mg B. Al
C. Cr D. Cu
Answer: - Option C
Explanation: - Chromium (Cr) increases corrosion resistance property of steel, So Cr is used as an alloying element in Steel.
Under the humid conditions, the reaction that occur at cathode when iron hinges plated with copper is
A. Catalysis B. Reduction
C. Redox reaction D. Oxidation
Answer: - Option B
Explanation: - In electrochemical cell cathode undergoes reduction that means cathode gains electrons from anode.
Name the metal used to protect the metal from corrosion by sacrificial anodic protection
A. Fe B. Mn
C. Zn D. Co
Answer: - Option C
Explanation: - In electrochemical series Zn is placed at the top of Fe, Mn and Co. Zn will oxidize easily , so Zn used to protect base metal from corrosion.
The reaction taking place in oxygen absorption mechanism of iron in presence of neutral aqueous solution in excess supply of oxygen is
A. Cu++ + 2e- Cu B. FeSO4 Fe++ + SO4- -
C. Cu Cu++ + 2e- D. Fe++ + 2(OH)- Fe(OH)2
Answer: - Option D
Explanation: - In electrochemical series Zn is placed at the top of Fe, Mn and Co. Zn will oxidize easily , so Zn used to protect base metal from corrosion.
The product obtain at cathode during electrolysis of aqueous CuSO4 solution using platinum electrode is
A. Deposition of SO4-- B. Deposition of Cu
C. Deposition of Mg D. Deposition of Zn
Answer: - Option B
Explanation: - In the electrolysis of aqueous CuSO4, Cu++ ions attract toward cathode and gain electrons from cathode. When Cu++ ions gain electrons, they convert into Cu atoms and deposit on cathode.
The metal used in galvanizing to form protective coating on iron sheet is
A. Cu B. Mg
C. Zn D. Al
Answer: - Option C
Explanation: - In galvanizing process Zn metal is used as a coating material on iron sheet.
One of the method used for the prevention of metal from corrosion by modification of environment is
A. Addition of inhibitor B. Removal of corrosion stimulant
C. Removal of inhibitor D. Addition of stimulant
Answer: - Option B
Explanation: - We can minimize corrosion by removal of corrosion stimulants like humidity, acidic and basic medium from the environment.
In Daniel cell, anode and cathode respectively are made up of
A. Zn and Cu B. Cu and Zn
C. Al and Mg D. Al and Cu
Answer: - Option A
Explanation: - In Daniel cell Zn acts as anode while Cu acts as cathode.
Name the reaction taking place at anode in Daniel cell
A. Oxidation B. Reduction
C. Redox reaction D. None of above
Answer: - Option A
Explanation: - In Daniel cell Zn acts as anode while Cu acts as cathode. Where Zn undergoes oxidation reaction.
Several blocks of Mg are fixed to the bottom of the ship to avoid
A. Weight B. Corrosion
C. Both A and B D. None of above
Answer: - Option B
Explanation: - Mg blocks act as anode and protect ship from corrosion.
Reduction potential is the measure of tendency of electrode to
A. Loss of proton B. Loss of electron
C. Gain of proton D. Gain of electron
Answer: - Option D
Explanation: - Reduction potential is the measure of tendency of electrode to gain electrons.
Relation between chemical equivalent and electrochemical equivalent is
A. C.E.=96500*E.C.E. B. 96500*C.E.=E.C.E.
C. C.E.=E.C.E./2 D. C.E.=E.C.E.
Answer: - Option A
Explanation: - Chemical Equivalent = 96500* Electrochemical Equivalent
During electro refining of blister copper 1% H2SO4 is added to electrolyte
A. To decrease ionization B. To increase ionization
C. To improve its conductivity D. None of the above
Answer: - Option C
Explanation: - 1% H2SO4 is added to electrolyte to improve conductivity.
Ammonium hydroxide considered as a weak electrolyte as in the aqueous solution it
A. Weakly ionizes B. Dissolved completely
C. Never ionizes D. Highly ionizes
Answer: - Option A
Explanation: - NH4OH is a weak electrolyte, which ionizes
Which of the following is nonelectrolyte?
A. Aq. ZnSO4 B. Aq. CuSO4
C. Aq. AlCl3 D. Ethanol, Glucose, CCl4, kerosene
Answer: - Option D
Explanation: - Ethanol, Glucose, CCl4, kerosene are nonelectrolyte as they are insoluble in solvent.
When aqueous solution of silver nitrate is used as an electrolyte during electrolysis then the ions which moves towards the cathode is
A. Ag+ B.NO3-
C. Zn++ D. Cu++
Answer: - Option A
Explanation: - Silver Nitrate (AgNO3) ionizes into Ag+ and NO3-. Ag+ ions attract toward the cathode and deposit on cathode.
1 Faraday =
A. 900 coulomb B. 96500 coulomb
C. 9650 coulomb D. 9500 coulomb
Answer: - Option B
Explanation: - 1 Faraday = 96500 Coulomb
The substance which in their aqueous/molten state produces ions & allow the electric current to pass through them are known as
A. Non electrolyte B. Cathode
C. Electrolyte D. Electrode
Answer: - Option C
Explanation: - The substance which in their aqueous/molten state produces ions & allow the electric current to pass through them are known as electrolyte.
The metal which is placed at the top of the electrochemical series is
A. Undergoes electrolysis B. Undergoes oxidation
C. Undergoes reduction D. None of the above
Answer: - Option B
Explanation: - According to electrochemical series, the metal which is placed at the top of electrochemical series has more tendency to lose electrons easily due to that it undergoes oxidation.
Due to the passage of electric current, the electrolyte undergoes
A. Deposition B. Oxidation
C. Reduction D. Redox reaction
Answer: - Option A
Explanation: - The Electrolyte which in their aqueous/molten state produces ions & after passing electric current ions deposit on respective electrode.
The aqueous CuSO4 solution allows electric current to pass through it, hence it is called
A. Electrolyte B. Solute
C. Non electrolyte D. Solution
Answer: - Option A
Explanation: - The aqueous CuSO4 solution produces ions like Cu++ and SO4- - & after passing electric current ions deposit on respective electrode. Hence it is called electrolyte.
During electrolysis, the ions moving towards the anode are
A. Anions B. Cations
C. Catalyst D. Inhibitors
Answer: - Option A
Explanation: - Anode is positively charged electrode and Anions are negatively charged ions and anions move towards the anode which is oppositely charged electrode.
Pitting corrosion in stainless steel can be reduced by adding
A. 10% Cu B. Pb
C. Al D. 3-4% Mo
Answer: - Option D
Explanation: - Stainless steel is an alloy of Fe with composition of C and 3-4% Mo. Mo helps to improve corrosion resistance property of stainless steel.
Galvanized container are not used for storing food products because
A. Not reacts with Zn B. Galvanized container are costly
C. Poisonous products are formed D. All of above
Answer: - Option C
Explanation: - In galvanization process Zinc is coated on the surface of steel or iron metal. Here Zinc reacts with acidic food content and form poisonous products which are hazardous to human.
Select the inert electrode from the following
A. Copper B. Zinc
C. Aluminum D. Platinum
Answer: - Option D
Explanation: - Inert means it is not reactive. An inert electrode is needed to conduct the electrons but it is not part of the redox reaction. Examples of inert electrode are Platinum (Pt) and Carbon.
Name the weak electrolyte from the following
A. KOH B. NH4Cl
C. NaOH D. HCl
Answer: - Option B
Explanation: - NH4Cl is a weak electrolyte, which ionizes weakly in solution.
The non-rechargeable cells are called
A. Secondary cell B. Ni-Cd cell
C. Lead storage cell D. Primary cell
Answer: - Option D
Explanation: - A primary cell is a battery (a galvanic cell) that is designed to be used once and discarded, and not recharged with electricity and reused like a secondary cell (rechargeable battery).
A piece of gold not react spontaneously with 1.0 M HCl select the correct statement
A. Gold is at the top in E.C.S. than H+ B. Gold is very active metal
C. Gold is at the bottom in E.C.S. than H+ D. None of the above
Answer: - Option C
Explanation: - According to electrochemical series, the metal which is placed at the top of electrochemical series has more tendency to lose electrons easily ,Here Gold is at the bottom in E.C.S. than H+ due to that A piece of gold not reacts spontaneously.
During electrolysis 2 ampere of current is passed through CuSO4 & ZnSO4 solution which are connected in series, if amount of Cu deposited is 3.17 gm, calculate the amount of Zn deposited, Given C.E. of Cu is 31.75 & C.E. of Zn is 32.5
A. 32.4 gm B. 324 gm
C. 3.24 gm D. 0.324 gm
Answer: - Option C
Explanation: -Faraday’s Second law of electrolysis =
Calculate the weight of a substance deposited when current of 1.5 ampere is passed through solution for 30 minutes, given: E.C.E. =0.000337
A. 83.3 gm B. 87.9 gm
C. 0.891 gm D. 89.9 gm
Answer: - Option C
Explanation: - Faraday’s First law of electrolysis W= zct. Where z is electrochemical equivalent i.e. E.C.E.
Calculate the equivalent weight of substance if its electrochemical equivalent is 0.00032 gm
A. 30.88 gm B. 0.31 gm
C. 0.308 gm D. 0.32 gm
Answer: - Option A
Explanation: - Chemical Equivalent = 96500* Electrochemical Equivalent
Choose the electrode at which oxidation takes place in electrochemical cell
A. Cathode B. Anode
C. Pt D. Inert electrode
Answer: - Option B
Explanation: - In electrochemical cell oxidation takes place at anode.
Calculate the time in minutes, when 0.921 gm substance is deposited by passing current of 2.5 ampere through ZnSO4 solution for given ECE of Zn=0.000304
A. 20.19 minutes B. 1211.84 minutes
C. 1112.2 minutes D. None of above
Answer: - Option A
Explanation: - Faraday’s First law of electrolysis is W= zct. Where z is electrochemical equivalent i.e. E.C.E.
Underground part of buried electric pole undergoes corrosion due to
A. Cathodic protection B. Sacrificial anodic method
C. Differential aeration principle D. None of above
Answer: - Option C
Explanation: - Differential aeration corrosion is a type of corrosion that occurs when oxygen concentrations vary across a metal's surface. The varying concentration of oxygen creates an anode and a cathode on the metal's surface.
Calculate the chemical equivalent of Zn ,when CuSO4 & ZnSO4 solutions are electrolyzed in series, the weight of a Cu & Zn deposited are 6.35 gm and 6.5 gm respectively.(given :atomic wt. of Cu=63.5 gm)
A. 0.325 gm B. 32.5 gm
C. 325 gm D. 0.30 gm
Answer: - Option B
Explanation: -Faraday’s Second law of electrolysis =
The electrolytic solution is
A. Electrically negative B. Electrically neutral
C. Electrically positive D. None of the above
Answer: - Option B
Explanation: - The dissolved electrolyte separates into cations and anions, which disperse uniformly through the solvent. Electrically, such a solution is neutral.
The process of attaching more active metal to an iron object for preventing from corrosion is
A. O2 absorption B. H2 evolution
C. Sacrificial anode D. Cathodic protection
Answer: - Option D
Explanation: - Cathodic protection is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell. Simple method of protection connects the metal to be protected to a more easily corroded "sacrificial metal" to act as the anode.
If 96500 coulomb of charge deposited 108 gm of silver, calculate the weight of silver deposited when 9650 coulomb of charge is passed
A. 110 gm B. 118 gm
C. 11.8 gm D. 10.8 gm
Answer: - Option D
Explanation: - If 96500 coulomb of charge deposited 108 gm of silver, then the weight of silver deposited is 10.8gm. When 9650 coulomb of charge is passed
The technique particularly used for protection of underground pipeline in industry is called as
A. O2 absorption B. Impressed current
C. Sacrificial anode D. H2 evolution
Answer: - Option B
Explanation: - Impressed current is a type of cathodic protection utilizing electrochemical means to obtain protection against corrosion.
In which state the common salt does not conduct electricity?
A. Liquid B. Gaseous
C. Solid D. None of the above
Answer: - Option C
Explanation: - We require free ions for electrical conductivity. Because of that solid material does not conduct electricity.
Coating of which metal is anodic on steel according to galvanic cell
A. Co B. Mg
C. Both A and B D. None of the above
Answer: - Option B
Explanation: - In electrochemical series Mg present above the iron (Fe) metal. Due to this, coating of Mg metal is anodic on steel according to galvanic cell.
The weight of a substance liberated/deposit by passing one faraday of electricity is equal to,
A. 96500 coulomb B. Two gram equivalent of substance
C. 96500 gm D. one gram equivalent of substance
Answer: - Option D
Explanation: - The weight of a substance liberated/deposit by passing one faraday of electricity is equal to, one gram equivalent of substance.
Calculate E.C.E. of Cu, if atomic weight of Cu is 63.5
A. 3.3 g/c B. 0.00033 g/c
C. 0.00 D. 0.033 g/c
Answer: - Option B
Explanation: - Chemical Equivalent = 96500* Electrochemical Equivalent
The chemical reaction in primary cell is
A. Slow B. Irreversible
C. Reversible D. Fast
Answer: - Option B
Explanation: - A primary cell is a battery (a galvanic cell) that is designed to be used once and discarded, and not recharged with electricity and reused like a secondary cell (rechargeable battery). Primary cells are those batteries in which irreversible chemical reactions are used to generate electrical energy.
In galvanizing process NH4Cl flux is used for avoid--------------
A. Oxidation B. Reduction
C. Redox reaction D. None of the above
Answer: - Option A
Explanation: - In galvanizing process NH4Cl flux is used for avoid oxidation of molten zinc metal.
Name the mechanism of corrosion in given situation-A metallic structure with two dissimilar metals built in river, polluted with acidic waste from nearby industry ------------
A. Cathodic protection B. Sacrificial anodic method
C. H2 evolution D. None of the above
Answer: - Option C
Explanation: - H2 evolution mechanism takes place in presence of acidic medium.
NaOH is strong electrolyte, as in the aqueous solution it ---------------
A. Not ionizes B. Highly ionizes
C. Feebly ionizes D. None of the above
Answer: - Option B
Explanation: - NaOH is strong electrolyte, as in the aqueous solution it highly ionizes or completely ionizes.
Electrolyte conduct electricity due to presence of
A. Atoms B. Electrons
C. Ions D. Crystals
Answer: - Option C
Explanation: - Electrolyte conduct electricity due to presence of ions.
Solid NaCl does not undergo electrolysis due to
A. Cations B. Absence of ions
C. Presence of ions D. Anions
Answer: - Option B
Explanation: - Solid-state does not allow the movement of ions and unsuitable for electrolysis.
The metal that form unstable oxide film is
A. Zn B. Fe
C. Ag D. Cu
Answer: - Option C
Explanation: - Unstable oxide film:- The metal oxide film immediately decomposes to metal & O2 as soon as it is formed, hence further oxidation doesn’t take place. E.g. Pt, Au, Ag.
According to faradays second law "the weight of a substance deposited /liberated at a particular electrode is directly proportional to it’s
A. Chemical equivalent B. Equivalent weight
C. Both a and b D. Molecular weight
Answer: - Option C
Explanation: - The weight of a substance deposited /liberated at a particular electrode is directly proportional to its chemical equivalent or equivalent weight.
A team of engineers on inspection of bridge observed that the part of metallic bridge under water is more corroded than one which is above the sea level, the type of corrosion takes place in this case is
A. O2 absorption B. H2 evolution
C. Sacrificial anodic method D. Concentration cell
Answer: - Option D
Explanation: - A concentration cell is a type of galvanic cell in which two electrodes are made up of same material and are dipped into same electrolyte of same composition but different concentrations.
Identify the secondary cell in the following
A. Ni-Cd cell B. Daniel cell
C. Dry cell D. None of the above
Answer: - Option A
Explanation: - Lead storage battery and nickel – cadmium storage cells are the examples of secondary cells.
During electro refining of blister copper, anode mud obtain is consist of
A. Fe, Sn B. Au,Ag
C. Zn D. Cu
Answer: - Option B
Explanation: - During electro refining of blister copper, anode mud obtain is consist of Au, Ag
When two dissimilar metals are electrically connected, then the more active metal becomes,
A. Anode B. Anode and cathode
C. Cathode D. None of the above
Answer: - Option A
Explanation: - When two dissimilar metals are electrically connected, then the more active metal becomes anode and undergoes oxidation.
The electrolyte used for electroplating of iron spoon with silver is
A. K(Ag (CN)2) B. Ag(OH)2
C. AlCl3 D. None of above
Answer: - Option A
Explanation: - The electrolyte used for electroplating of iron spoon with silver is K(Ag (CN)2)
In Daniel cell, the reactions are--------------
A. Reversible B. Fast
C. Slow D. Irreversible
Answer: - Option D
Explanation: - Daniel cell is a primary cell hence reactions are irreversible.
Ionic compounds when dissolved in solvent like water produces
A. Anions B. Ions
C. Cations D. None
Answer: - Option B
Explanation: - Ionic compounds when dissolved in solvent like water produces ions . E.g. NaCl produces Na+ and Cl-.
In electro refining of blister Cu, the electrolyte is
A. CuSO4 B. NaCl
C. FeCl3 D. ZnSO4
Answer: - Option A
Explanation: - In electro refining of blister Cu, the electrolyte is CuSO4 .
The metal used to coat copper wire to protect it from the attack of sulphur before its insulation by rubber is
A. Al B. Zn
C. Cu D. Sn
Answer: - Option D
Explanation: - Sn metal used to coat copper wire to protect it from the attack of sulphur before its insulation .
Electrochemical equivalent is defined as the weight of a substance deposited/liberated by passing electricity.
A. 35 coulomb B. 1 coulomb
C. 10 coulomb D. 96500 coulomb
Answer: - Option B
06– PAINTS, VARNISHES, INSULATORS, POLYMERS, ADHESIVE AND LUBRICANTS
Q 1. An example of plasticizer used in paints is
A. Tributyl phosphate B. Triphenyl phosphate
C. Tricresyl phosphate D. All of these
Answer: - Option D
Explanation: - All impart flexibility to the resin, thus minimizing film cracking.
Q 2. Select the option which is not a constituent of paint
A. Pigment B. Plasticizer
C. Driers D. Resin
Answer: - Option D
Explanation: - Remaining all constituents possesses physical characteristics to the paint.
Q 3. An example of low thermal insulator
A. Cork B. Glass wool
C. Asbestos D. All of the above
Answer: - Option D
Explanation: - All materials are poor conductor of thermal energy.
Q 4. Phenol formaldehyde adhesive find application in manufacturing
A. Card boxes B. Furniture
C. Conveyor belts D. Laminates
Answer: - Option D
Explanation: - Phenol formaldehyde resins are synthetic polymers used to manufacture high- pressure laminates and adhesives.
Q 5. A solution of resin in alcohol is example of
A. Paint B. Emulsion
C. None of these D. Spirit varnish
Answer: - Option D
Explanation: - Most resin or gum varnishes consist of a natural, plant- or insect-derived
substance dissolved in a solvent, called spirit varnish or solvent varnish. The solvent may be alcohol, turpentine, or petroleum-based. Some resins are soluble in both alcohol and turpentine.
Q 6. Name the adhesive which is used in aircraft industry
A. Wax B. Starch
C. Asphalt D. Araldite
Answer: - Option D
Explanation: - It has very high shear strength even at temperatures up to 70°C and good peel strength.
Q 7. Predict the adhesive which is used in the sealing operation in food industry
A. Acrylics B. Cellulose
C. Polyesters D. Polyvinyl.
Answer: - Option D
Explanation: - It show very good adhesion to various substrates, high mechanical strength, as well as good flexibility and chemical resistance.
Q 8. Select an In-organic thermal insulator
A. Rubber B. Glass wool
C. Silk D. Wool
Answer: - Option B
Explanation: - Thermal insulation materials are classified as either organic or inorganic. Silk, wool, wood- pulp, and sawdust are a few examples of organic materials. Some common inorganic insulating materials are glass wool, slag, charcoal, and coke powder.
Identify the non-insulating material
A. Asbestos B. Thermocole
C. Copper D. Glass wool
Answer: - Option C
Explanation: - As the body of pots and pans used in the kitchen are made of metals like copper and aluminium, they will be good conductors of electricity and therefore will be categorized as “not an insulator”.
The function of pigment is
A. To improve drying quality B. To give adhesion
C. To give strength to paint film D. To suspend pigments
Answer: - Option C
Explanation: - Pigments are finely ground natural or synthetic, insoluble particles used to impart color when added to paints and coatings formulations. They are also used to impart bulk or a desired physical and chemical property to the wet or dry film.
In oil varnish role of oil is
A. Protect the film from cracking B. Reduces brittleness of resin film
C. Both a and b D. None of the above
Answer: - Option C
Explanation: - Varnishes provide protective coatings for wooden surfaces, paintings, and various decorative objects. Varnish protects and enhances the appearance of wooden floors, interior wood paneling and trim, and furniture.
An example of gaseous insulators
A. CCl2F2 B. CO2
C. N2 D. All of these
Answer: - Option D
Explanation: - A dielectric gas is also called as an insulating gas. It is a dielectric material in gaseous state which can prevent electrical discharge.
Viscosity of oil is measured by using
A. Viscometer B. Cleveland open cup apparatus
C. Redwood viscometer D. Both B and C
Answer: - Option C
Explanation: - Redwood Viscometer is normally used for the determination of the viscosity of petroleum products. 'Redwood Viscometer' determines the viscosity in terms of seconds.
An example of natural, adhesive used for stamps and envelops
A. Epoxy resin B. Starch adhesive
C. Acrylics D. Animal glue
Answer: - Option B
Explanation: -Starch adhesive is the substance applied to the back of a stamp to enable it to adhere to a letter or other mailed item.
Select the pigment which gives white colour to the paint
A. Zinc oxide B. Titanium oxide
C. Ferrous oxide D. Both A and B
Answer: - Option D
Explanation: - It is the whitest and brightest of known pigments, with reflective qualities; it can also both scatter and absorb UV rays.
Paint is a mechanical dispersion mixture of one or more
A. Pigments in drying oil B. Extender in drying oil
C. Plasticizer in drying oil D. Atom
Answer: -Option A
Explanation: - Drying oil, unsaturated fatty oil, either natural (such as linseed oil) or synthetic, that when spread into a thin film becomes hard, tough, and elastic upon exposure to the air.
The main film forming constituents of paint are
A. Thinner B. Plasticizer
C. Pigment D. Vehicle
Answer: - Option D
Explanation: - Paint is a Mechanical dispersion of one or more pigment in a vehicle. The vehicle is liquid consisting of nonvolatile film forming material.
Special anti-fouling paints can be applied on the surface of ship to protect it from
A. Destruction B. Breaking
C. Corrosion D. None of these
Answer: - Option C
Explanation: - Antifouling paint, applied to the underwater hull of ships, discourages or prevents the growth of organisms that attach to the hull. Its self-polishing resin and biocide, such as cuprous oxide along with a booster biocide, help to prevent bio fouling organisms.
Name of the constituents present in paint normally not present in a varnish
A. Plasticizer B. Drying oil
C. Pigment D. Resin
Answer: - Option C
Explanation: - paint normally contains a pigment while a varnish usually contains a resin. In a paint, pigment is dispersed in a vehicle while in a varnish, a resin is dispersed in oil or thinner.
A solution of resin in alcohol
A. Spirit varnish B. Varnish
C. None of these D. Oil varnish
Answer: - Option A
Explanation: - Most resin or gum varnishes consist of a natural, plant- or insect-derived substance dissolved in a solvent, called spirit varnish or solvent varnish. The solvent may be alcohol, turpentine, or petroleum-based. Some resins are soluble in both alcohol and turpentine.
A volatile organic constituents of paint is
A. Pigment B. Thinner
C. Drying oil D. All of these
Answer: - Option B
Explanation: - Volatile organic constituents are solvents that get released into the air as the paint dries.
Opacity and desired colour of paints are provided by
A. Thinner B. Pigment
C. Resin D. Extender
Answer: - Option B
Explanation: - All inorganic pigments have high refractive indices, and hence, when used to color paint give high opacity.
In paint the role of thinner is
A. Improve drying quality B. Reducethe cos
C. Provide water proofness D. Reduce viscosity or to reduce consistency
Answer: - Option D
Explanation: - Paint thinners are solvents that can dissolve paint and reduce viscosity of paint.
A glass is good insulator because of
A. Low electrical conductivity B. Non-combustible and fire proof
C. Low thermal conductivity D. All of these
Answer: - Option D
Explanation: - a material like glass has no free electrons and in the absence of free or delocalized electrons, it is unable to conduct electricity. We can also say that all the electrons are tightly bound around the atoms in the case of glass.
Important characteristics of adhesive
A. To form film having greater tensile strength B. Joints to parts together
C. Suitable surface tension and low viscosity D. All of these
Answer: - Option D
Explanation: - Adhesives are designed for specific applications. Besides their role in the adhesion process, they can be used for other purposes, such as sealing agents, in order to eliminate the effect of
self-loosening caused by dynamic loads, sealing of areas to prevent oxidation and corrosion, waterproofing, etc.
Turpentine oil in paint is used as a
A. Extender B. Plasticizer
C. Thinner D. Pigment
Answer: - Option C
Explanation: - Turpentine is used for thinning oil-based paints, for producing varnishes and as a raw material for the chemical industry.
Constituents which reduce viscosity of paint is
A. Thinner B. Resin
C. Pigment D. Plasticizer
Answer: - Option A
Explanation: - Paint thinners are solvents that can dissolve paint and reduce viscosity of paint.
Red pigment is
A. Ferric oxide B. Red lead
C. Chrome red D. All of these
Answer: - Option D
Explanation: - Pigment is the actual coloring substance of paint. Pigment has body in contradistinction to purely visual color.
A constituents which increase the random arrangement of pigment in paint is
A. Plasticizer B.Thinner
C. Extender or filler D. Resin
Answer: - Option C
Explanation: - component whose purpose is to reduce the cost of the ink, by increasing the area covered by a given weight of pigment.
In spirit varnish small amount of plasticizer is added to avoid
A. To give high hiding power B. Transparent finish
C. To avoid Cracking of paint film D. None of these
Answer: - Option C
Explanation: - Plasticizer is a substance that is added to a material to make it softer and more flexible, to increase its plasticity, to decrease its viscosity, or to decrease friction during its handling in manufacture.
Identify the constituents which are used to fill the voids or pores in the paints
A. Driers B. Thinner
C. Extender or filler D. Plasticizer
Answer: - Option C
Explanation: - Extenders are natural or synthetic materials finely distributed into paint. Extender /filler pigments, which are essential for properties like filling, sanding, flow and durability; in general, less binder is used in undercoats.
Chloroform is used as anesthetic 2% ethanol is added
A. To prevent formation of phosgene gas B. To prevent reduction
C. To prevent oxidation D. None of these
Answer: - Option A
Explanation: - When chloroform is exposed to atmospheric oxygen, it gets converted to phosgene gas. To prevent this, little ethanol is added to chloroform bottle. Ethanol converts this phosgene to ethyl carbonate.
In paint toluene is used as
A. Thinner B. Solvent
C. Driers D. Extender
Answer: - Option B
Explanation: - Toluene is a colorless, flammable liquid with a sweet pungent odor. Toluene has numerous commercial and industrial applications: it is a solvent in paints, lacquers, thinners, glues, correction fluid, and nail polish remover, and is used in the printing and leather tanning processes.
Glass wool & Thermocole are used as an insulator
A. Laptop B. Fridge and microwave oven
C. Furnace D. None of these
Answer: - Option B
Explanation: - Glass wool is an insulating material made from fibres of glass arranged using a binder into a texture similar to wool.
An example of plasticizer used in paints is
A. Tributyl phosphate B. Triphenyl phosphate
C. Tricresyl phosphate D. All of these
Answer: - Option D
Explanation: - A plasticizer is a substance that is added to a material to make it softer and more flexible, to increase its plasticity, to decrease its viscosity, or to decrease friction during its handling in manufacture.
The alternative name of Teflon is
A. Polytetrafloro methyl B. Poly tetra fluro benzene
C. Polytetra fluro ethylene D. Polytetra fluro ethylene
Answer: - Option D
Explanation: - Polytetrafluoroethylene (PTFE), a strong, tough, waxy, nonflammable synthetic resin produced by the polymerization of tetrafluoroethylene.
The lubricant used for cutting tools is
A. Water B. Oil
C. Petrol D. None of these
Answer: - Option A
Explanation: - Cutting fluid is a fluid that is mainly used to remove the heat produced during the metal cutting and other machining processes. It is also used as a lubricant in some cases. They are also used for improving the cutting condition and also the tool life.
Greases are not used to lubricant
A. Scissor B. Sewing machine
C. All of these D. None of these
Answer: - Option B
Explanation: - Grease is sometimes used to describe lubricating materials that are simply soft solids or high viscosity liquids, but these materials do not exhibit the shear-thinning properties characteristic of the classical grease.
The process of polymerization in which there is no elimination of by product is
A. Addition polymerisation B. Condensation polymerisation
C. Both are correct D. None
Answer: - Option A
Explanation: - In addition polymerization, monomers react to form a polymer without the formation of by- products. Addition polymerizations usually are carried out in the presence of catalysts
Important characteristics of adhesive
A. resistant to heat B. Non Resistant to heat
C. Both are correct D. None
Answer: - Option B
Explanation: - Adhesive has rapid bonding at room temperature, which can be further accelerated by an increase in the temperature or the use of accelerators
Degree of tackiness rapidly of bonding, durability is the properties
A. Polythene B. Plastic
C. Rubber D. None
Answer: - Option C
Explanation: Adhesive bonding is an efficient, economical, and durable method is a property called tackiness.
Important characteristics of adhesive
A. resistant to heat B. Non Resistant to heat
C. Both are correct D. None
Answer: - Option B
Explanation: - A polymer having predominantly weak bonds between atoms should not be used for high- temperature applications.
In steam turbine solid lubricants are used because
A. at high pressure B. Only high temperature
C. High temperature and pressure D. None of these
Answer: - Option C
Explanation: - In steam turbine solid lubricants are used because to reduce the friction.
Axle greases are prepared by
A. Polymer added B. Adding soda
C. Adding lime or any heavy metal hydroxide to resin & fatty oils D. None
Answer: - Option C
Explanation: - Greases are prepared by saponification of fat with alkali followed by adding hot lubricating oil while under agitation.
Free radical mechanism is involved in
A. Chain reaction B. Addition reaction
C. Condensation reaction D. None
Answer: - Option A
Explanation: - A radical substitution reaction is a reaction which occurs by a free radical mechanism and results in the substitution of one or more of the atoms or groups present in the substrate by different atoms or groups. The initiation step in a radical chain reaction is the step in which a free radical is first produced.
Monomer of same type is starting material to make polymer under
A. Chain reaction B. Addition polymer
C. Condensation reaction D. None
Answer: - Option B
Explanation: - Monomers are small molecules which may be joined together in a repeating fashion to form more complex molecules called polymers.
Machines operating under high temperature & load are lubricant by
A. Silicone B. Graphite, soap stone, Molybdenum disulphide
C. Condensation reaction D. None
Answer: - Option B
Explanation: - Materials such as graphite and molybdenum disulfide, commonly called molysulfide, have a crystal lattice structure arranged in layers. Strong bonds between atoms within a layer and relatively weak bonds between atoms of different layers allow the lamina to slide on one another.
The reaction given below indicates the synthesis of polymer nCH2=CHCL Product (in
presence of benzoyl peroxide)
A. RVC B. PVC
C. WBC D. MVC
Answer: - Option B
Explanation: - Polyvinyl chloride is produced by polymerization of the vinyl chloride monomer (VCM).
On the basis of thermal behavior polymer are classified
A. Thermoplastic & thermosetting B. Only thermoplastic
C. Only thermosetting D. None
Answer: - Option A
Explanation: - Based on the thermal behavior, polymers are classified into thermoplastic polymers and thermosetting polymers.
By product is liberated during the manufacturing of
A. Condensation reaction B. Addition reaction
C. Both the reaction D. None of these
Answer: - Option A
Explanation: - In organic chemistry, a condensation reaction is a type of chemical reaction in which two molecules are combined to form a single molecule, usually with the loss of a small molecule such as water.
On the basis of structure the polymer are classified as-
A. Cross linked polymer B. Linear chain polymer
C. Both the polymer D. None
Answer: - Option C
Explanation: - Polymers can be classified into three main types based on structure. These are linear polymers, branched chain polymers and cross- linking polymers. Linear polymers are formed of long, straight chains and branched chain polymers contain of linear chains having branches.
Lubricants used in machines working at low temp should posses
A. Low pour point B. High pour point
C. Low temperature D. High temperature
Answer: - Option A
Explanation: - Pour point depressants are polymers that allow oil and lubricants to flow at very low wintertime temperatures without heavy wax formation at these cold temperatures and enable the oil to remain pumpable (flowable).
Select the thermosetting synthetic adhesives from the following
A. Polythene B. Acetylene
C. Resin D. Polyurethane
Answer: - Option D
Explanation: - Thermoset adhesives are thermosetting polymers that are used to bond metallic or non- metallic substrates. They are cured using heat, pressure, or a combination of both. There exist several types of thermoset adhesives, and they are typically classified based on their chemical composition or polymer system. Polyurethane remains one of the most widely used types for several applications.
Handle of hot pans & heaters are made up of
A. Carbon B. Polymer
C. Bakelite D. None
Answer: - Option C
Explanation: - Bakelite is a good insulator used in non-conducting parts of radio and electric devices like switches, automobile distribution caps, insulation of wires, Sockets, etc.
The necessity of lubricants is
A. High viscosity B. Low viscosity
C. High & low viscosity D. None
Answer: - Option A
Explanation: - The thickness of the oil, is important because it determines the lubricant's film strength and efficiency in preventing friction between moving parts.
The insulating material which is used in air filter as a dust filtering
A. Fibrous insulating material B. Non fibrous material
C. Both of these D. None of these
Answer: - Option A
Explanation: - Fibrous materials capture the air within the fibres: this prevents heat transmission by convection and limits gaseous heat conduction by minimising collisions between gas molecules.
The selection of suitable lubricant for a specific purpose is made on the basis of
A. Low emulsification value B. Low acidity, low viscosity, low emulsification value
C. Low viscosity D. None of these
Answer: - Option B
Explanation: - Low acidity, low viscosity, low emulsification value are most important properties of lubricants which are of prime importance in lubrication. In order to get efficient lubrication, there should be no change in these properties during lubrication
Epoxy resins are obtained from
A. Phenol+Phenol B. Acetone + Phenol
C. Bisphenol +epichlorohydrin D. Benzene +Phenol
Answer: - Option C
Explanation: - Most common epoxy resins are produced from a reaction between epichlorohydrin (ECH) and bisphenol-A (BPA).
The monomer tetra-fluro ethylene can be used for the preparation
A. Polystyrene B. Teflon
C. PVC D. Polythene
Answer: - Option B
Explanation: - Teflon is not a product on its own, but a brand name of a product. It refers to a chemical coating known as polytetrafluoroethylene (PTFE). It's a type of plastic sprayed on various items and then baked to create a nonstick, waterproof, noncorrosive, and nonreactive surface.
On the basis of types of monomer the polymer are classified as
A. Homopolymer B. Homopolymer & Copolymer
C. Copolymer D. None
Answer: - Option B
Explanation: - If a polymer consists of only one kind of monomers then it is called a homopolymer, while a polymer which consists of more than one kind of monomers is called a copolymer.
Select the lubricant which is used for watches is
A. Ground nut oil B. Castor oil
C Hazel-nut oil D. None
Answer: - Option B
Explanation: - Castor oil is a vegetable oil pressed from castor beans. It is a colourless to very pale yellow liquid with a distinct taste and odor.
Glass wool and Thermocole are used as an insulator in
A. Tiffin boxes B. Fridge and microwave oven
C. Both D. None
Answer: - Option B
Explanation: - Glass wool has a number of properties which should make it desirable as a heat insulator. Thermocole are in fact an excellent thermal insulator for the Indian climate. They are lightweight and affordable (making them easy to install), with a high insulation value.
The property of good lubricant is it should have
A. Low viscosity & low acidity B. High viscosity & high acidity
C. Both of these D. None of these
Answer: - Option B
Explanation: - Higher viscosity lubricants are thick and don’t flow, while lower viscosity lubricants have a closer consistency to water and do flow.
Cup greases are prepared by mixing
A. Calcium soap with petroleum oil B. Potassium salts of higher fatty acids
C. None of these D. Both of these
Answer: - Option A
Explanation: - cup grease is regular grease blended from mineral base oils and calcium soap thickeners. It is suitable for lubrication points that are exposed to relatively mild conditions.
The lubricants used for gears is
A. Greases B. Oils
C. Soyabean oil D. Sunflower oil
Answer: - Option A
Explanation: - Grease is a thick oily substance which is commonly used as a lubricant. it can act as a sealant and is commonly used in the automotive industry for tasks such as chassis, wheel bearings and gears.
The polyvinyl chloride is formed by
A. Vinyl chloride B. Ethylene
C. Alcohol D. Propylene
Answer: - Option A
Explanation: - Vinyl chloride, also called chloroethylene, a colourless, flammable, toxic gas belonging to the family of organohalogen compounds and used principally in making polyvinyl chloride, or PVC, a widely used plastic with numerous applications.
The type of lubricant used for scissor is
A. Synthetic oil B. Grease
C. Vegetable oil D. Sunflower oil
Answer: - Option A
Explanation: - Synthetic oil is used as a substitute for lubricant refined from petroleum when operating in extreme temperatures because, generally speaking, it provides superior mechanical and chemical properties to those found in traditional mineral oils.
On increasing the lubrication the efficiency of the machine
A. Increases B. Decreases
C. Both D. None
Answer: - Option A
Explanation: - Friction decreases due to lubrication, which increases efficiency.
Predict the adhesive which is used in the sealing operation in food industry
A. Polyacids B. Polymer
C Polynitriles D. Polyvinyl
Answer: - Option D
Explanation: - Polyvinyl adhesives produce clear, hard films that have good weather resistance and withstand water, grease, oil, and petroleum fuels.
The structure of thermoplastic is
A. Linear structure B. Cross linked structure
C. Regular structure D. Irregular structure
Answer: - Option A
Explanation: - A linear polymer is one in which each repeating unit is linked only to two others.
Resin is known as
A. Organic polymer with nonporous B. Organic polymer with porous
C. All of these D. None of these
Answer: - Option B
Explanation: - Organic polymers are macromolecules composed of many repeating monomer units.
For rocket & submarine the lubricant used is
A. Castor oil B. Natural oil
C. Synthetic oil D. None of these
Answer: - Option C
Explanation: - Synthetic oil is a man-made lubricant that consists of artificially made chemical compounds. Synthetic oils are typically created from chemically modified materials such as petroleum components, but the base material is almost always distilled crude oil.
Select the option which is an example of natural adhesive
A. Sodium silicate B. Synthetic adhesive
C. Vegetable glue D. NaCl
Answer: - Option C
Explanation: - Natural adhesives are derived from an organic source. Glue can be formed from many naturally occurring substances, including proteins like gelatin, starch, and cellulose.
An example of gaseous insulator is
A. Neoprene B. Silicon
C. MnO2 D. CO2 dry air
Answer: - Option D
Explanation: - A dielectric gas is also called as an insulating gas. It is a dielectric material in gaseous state which can prevent electrical discharge.
Important Characteristics of adhesive is
A. It should be odour B. Smooth
C. Bond formed should be strong & long lasting D. Weak bond
Answer: - Option C
Explanation: - Adhesive Bonding is the process of joining two surfaces together, usually with the creation of a smooth bond.
Greases is prepared by saponification of
A. Fat with acid B. Fat with alkalies
C. All of these D. None of these
Answer: - Option B
Explanation: - Saponification is a process that involves the conversion of fat, oil, or lipid, into soap and alcohol by the action of aqueous alkali
