MCQ Questions for Class 12 Chemistry Chapter 3 Electrochemistry with Answers

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Q.1 The charge required for the reduction of 1 mol of MnO4– to MnO2 is

(a) 1 F
(b) 3 F
(c) 5 F
(d) 6 F

(b) 3 F

Q.2 If limiting molar conductivity of Ca2+ and Cl– are 119.0 and 76.3 S cm2 mol-1, then the value of limiting molar conductivity of CaCl2 will be

(a) 195.3 S cm2 mol-1
(b) 271.6 S cm2 mol-1
(c) 43.3 S cm2 mol-1
(d) 314.3 S cm2 mol-1

(b) 3 F

Q.3 NH4NC>3 is used in salt bridge because

(a) it forms a jelly like material with agar-agar.
(b) it is a weak electrolyte.
(c) it is a good conductor of electricity.
(d) the transport number of NH4+ and NO3– ions are almost equal.

(d) the transport number of NH4+ and NO3– ions are almost equal.

Q.4 The reaction, 3ClO– (aq) → ClO3 (aq) + 2Cl– (aq) is an example of

(a) Oxidation reaction
(b) Reduction reaction
(c) Disproportionation reaction
(d) Decomposition reaction

(c) Disproportionation reaction

Q.5 The emf of the cell:
Ni / Ni2+ (1.0 M) // Au3+ (1.0 M) / Au (E° = -0.25 V for Ni2+/Ni; E° = 1.5 V for Au3+/Au) is

(a) 1.25 V
(b) -1.25 V
(c) 1.75 V
(d) 2.0 V

(c) 1.75 V

Q.6 The standard emf of a galvanic cell involving cell reaction with n = 2 is formed to be 0.295 V at 25° C. The equilibrium constant of the reaction would be

(a) 1.0 × 1010
(b) 2.0 × 1011
(c) 4.0 × 1012
(d) 1.0 × 102
[Given F = 96500 (mol-1); R = 8.314 JK-1 mol-1]

(a) 1.0 × 1010

Q.7 If E°Fe2+/Fe = -0.441 V and E°Fe2+/Fe2+ = 0.771 V, the standard EMF of the reaction,
Fe + 2Fe3+ → 3Fe2+ will be

(a) 1.212 V
(b) 0.111 V
(C) 0.330 V
(d) 1.653 V

(a) 1.212 V

Q.8 Fused NaCl on electrolysis gives ………….. on cathode.

(a) Chlroine
(b) Sodium
(c) Sodium amalgam
(d) Hydrogen

(b) Sodium

Q.9 The standard electrode potentials for the half cell reactions are:
Zn → Zn2-– 2e– E° = 0.76 V
Fe → Fe2- + 2– E° = -0.41 V
The emf of the cell reaction
Fe2- + Zn → Zn2- + Fe is

(a) -0.35 V
(b) +0.35 V
(c) -1.17 V
(d) +1.17 V

(b) +0.35 V

Q.10 Which of the following is a secondary cell?

(a) Leclanche cell
(b) Lead storage battery
(c) Concentration cell
(d) All of these

(b) Lead storage battery

Q.11 For a certain redox reaction, E° is positive. This means that

(a) ΔG° is positive, K is greater than 1
(b) ΔG° is positive, K is less than 1
(c) ΔG° is negative, K is greater than 1
(d) ΔG° is negative, K is less than 1

(c) ΔG° is negative, K is greater than 1

Q.12 Cell reaction is spontaneous, when

(a) E0red is negative
(b) ΔG° is negative
(c) E0oxid is Positive
(d) ΔG° is positive

(b) ΔG° is negative

Q.13 Equilibrium constant K is related to E0cell and not Ecell because

(a) E0cell is easier to measure than Ecell
(b) Ecell becomes zero at equilibrium point but E0cell remains constant under all conditions
(c) at a given temperature, Ecell changes hence value of K can’t be measured
(d) any of the terms Ecell or E0cell can be used

(b) Ecell becomes zero at equilibrium point but E0cell remains constant under all conditions

Q.14 Molar conductivity of 0.15 M solution of KCl at 298 K, if its conductivity of 0.0152 S cm-1 w ill be

(a) 124 Ω-1 cm² mol-1
(b) 204 Ω-1 cm² mol-1
(c) 101 Ω-1 cm² mol-1
(d) 300 Ω-1 cm² mol-1

(c) 101 Ω-1 cm² mol-1

Q.15 Electrical conductance through metals is called metallic or electronic conductance and is due to the movement of electrons. The electronic conductance depends on

(a) the nature and structure of the metal
(b) the number of valence electrons per atom
(c) change in temperature
(d) all of these

(d) all of these

Q.16 The specific conductivity of N/10 KCl solution at 20°C is 0.0212 ohm-1 cm-1 and the resistance of the cell containing this solution at 20°C is 55 ohm. The cell constant is

(a) 3.324 cm-1
(b) 1.166 cm-1
(c) 2.372 cm-1
(d) 3.682 cm-1

(b) 1.166 cm-1

Q.17 Faraday’s law of electrolysis is related to

(a) Atomic number of cation
(b) Speed of cation
(c) Speed of anion
(d) Equivalent weight of electrolyte

(d) Equivalent weight of electrolyte

Q.18 The molar conductivity is maximum for the solution of concentration

(a) 0.004 M
(b) 0.002 M
(c) 0.005 M
(d) 0.001 M

(d) 0.001 M

Q.19 Units of the properties measured are given below. Which of the properties has been not matched correctly?

(a) Molar conductance = Sm2 mol-1
(b) Cell constant = m-1
(c) Specific conductance of = S m²
(d) Equivalence conductance = S m² (g eq)-1

(c) Specific conductance of = S m²

Q.20 How long would it take to deposit 50 g of Al from an electrolytic cell containing Al2O3 using a current of 105 ampere?

(a) 1.54 h
(b) 1.42 h
(c) 1.32 h
(d) 2.15 h

(b) 1.42 h

Q.21 How many coulombs of electricity is required to reduce 1 mole of Cr2O2−7 in acidic medium?

(a) 4 × 96500 C
(b) 6 × 96500 C
(c) 2 × 96500 C
(d) 1 × 96500 C

(b) 6 × 96500 C

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