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Electrochemistry 12 MCQs Questions with Answers
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
Answer: (b) +0.35 V
Molar conductivity of 0.15 M solution of KCl at 298 K, if its conductivity of 0.0152 S cm-1 will 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
Answer: (c) 101 Ω-1 cm² mol-1
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
Answer: (b) 1.166 cm-1
Fused NaCl on electrolysis gives ………….. on cathode.
(a) Chlorine
(b) Sodium
(c) Sodium amalgam
(d) Hydrogen
Answer: (b) Sodium
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
Answer: (c) Specific conductance of = S m²
The reaction, 3ClO– (aq) → ClO3 (aq) + 2Cl– (aq) is an example of
(a) Oxidation reaction
(b) Reduction reaction
(c) Disproportionation reaction
(d) Decomposition reaction
Answer: (c) Disproportionation reaction
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]
Answer: (a) 1.0 × 1010
If a current of 1.5 ampere flows through a metallic wire for 3 hours, then how many electrons would flow through the wire?
(a) 2.25 × 1022 electrons
(b) 1.13 × 1023 electrons
(c) 1.01 × 1023 electrons
(d) 4.5 × 1023 electrons
Answer: (c) 1.01 × 1023 electrons
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
Answer: (b) 1.42 h
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
Answer: (a) 1.212 V
If 96500 coulomb electricity is passed through CuSO4 solution, it will liberate
(a) 63.5 gm of Cu
(b) 31.76 gm of Cu
(c) 96500 gm of Cu
(d) 100 gm of Cu
Answer: (b) 31.76 gm of Cu
How much time is required to deposit 1 × 10-3 cm thick layer of silver (density of 1.05 g cm-3) on a surface of area 100 cm² by passing a current of 5 A through AgNO3 solution?
(a) 125 s
(b) 115 s
(c) 18.7 s
(d) 27.25 s
Answer: (c) 18.7 s
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
Answer: (b) 3 F
A current of 1.40 ampere is passed through 500 mL of 0.180 M solution of zinc sulphate for 200 seconds. What will be the molarity of Zn2+ions after deposition of zinc?
(a) 0.154 M
(b) 0.177 M
(c) 2 M
(d) 0.180 M
Answer: (b) 0.177 M
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
Answer: (c) Specific conductance of = S m²
The standard reduction potentials of X, Y, Z metals are 0.52, -3.03, -1.18 respectively. The order of reducing power of the corresponding metals is:
(a) Y > Z > X
(b) X > Y > Z
(c) Z > Y > X
(d) Z > X > Y
Answer: (a) Y > Z > X
A solution of potassium bromide is treated with each of the following. Which one would liberate bromine?
(a) Hydrogen iodide
(b) Sulphur dioxide
(c) Chlorine
(d) Iodine
Answer: (c) Chlorine
Cell reaction is spontaneous, when
(a) E0red is negative
(b) ΔG° is negative
(c) E0oxid is Positive
(d) ΔG° is positive
Answer: (b) ΔG° is negative
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
Answer: (d) 0.001 M
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
Answer: (b) 6 × 96500 C
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
Answer: (d) Equivalent weight of electrolyte
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
Answer: (d) all of these
Equilibrium constant K is related to E0cell and not Ecell because
(a) Ecell 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
Answer: (b) Ecell becomes zero at equilibrium point but E0cell remains constant under all conditions
Which of the following is a secondary cell?
(a) Leclanche cell
(b) Lead storage battery
(c) Concentration cell
(d) All of these
Answer: (b) Lead storage battery
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
Answer: (c) ΔG° is negative, K is greater than 1
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