300+ TOP MCQs on Electrochemistry and Answers

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MCQs on Electrochemistry :

1. The aqueous solution of which of the following compounds is the best conductor of electric current?
(A) Acetic acid,
(B) Hydrochloric acid
(C) Ammonia
(D) Fructose

Answer

Answer: (b)

2. An increase in the conductivity equivalent of a solid electrolyte with dilution is primarily due to
(A) increased ionic mobility of ions
(B) 100 percent electrolyte ionisation with natural dilution
(C) increase in both ion numbers and ionic mobility
(D) A rise in ion counts

Answer

Answer: (a)

3. The ionic conductance of Ba²⁺ and Cl^– are respectively 127 and 76 ohm^-1 at infinite dilution. The equivalent conductance of BaCl₂ at infinite dilution will be
(A) 139.5
(B) 203
(C) 279
(D) 101.5

Answer

Answer: (a)

4. When heating one end of a metal plate, the other end gets hot because of
(A) the resistance of the metal
(B) mobility of atoms in the metal
(C) energised electrons moving to the other end
(D) minor perturbation in the energy of atoms.

Answer

Answer: (c)

5. The weight of silver displaced by a quantity of electricity which displaces 5600ml of O₂ at STP will be
(A) 5.4g
(B) 10.8g
(C) 54.9g
(D) 108.0g

Answer

Answer: (d)

6. Once a current of 1.0 ampere was passed through one litre of CuCl₂ solution for 16 min and 5 sec, all of the solution’s copper was deposited at the cathode. The power of solution CuCl₂ was (Molar mass of Cu = 63.5; Faraday constant = 96,500 C/mol)
(A) 0.01N
(B) 0.01M
(C) 0.02M
(D) 0.2N

Answer

Answer: (a)

7. On electrolysis of dilute sulphuric acid using platinum electrodes, the product obtained at the anode will be
(A) hydrogen
(B) oxygen
(C) hydrogen sulphide
(D) sulphur dioxide

Answer

Answer: (b)

8. A device that converts the energy of combustion of fields like hydrogen and methane directly into electrical energy is known as
(A) Electrolytic cell
(B) Dynamo
(C) Ni-Cd cell
(D) Fuel cell

Answer

Answer: (d)

9. Which reaction is not feasible?
(A) 2KO + Br₂ → 2KBr + I₂
(B) 2KBr + I₂ → 2KI + Br₂
(C) 2KBr + Cl₂ → 2KCl + Br₂
(D) 2H₂O + 2F₂ → 4HF + O₂

Answer

Answer: (b)

10. Without losing its concentration ZnCl₂ solution cannot be kept in contact with
(A) Au
(B) Al
(C) Pb
(D) Ag

Answer

Answer: (b)