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Class 12 Chemistry - Chapter 3: Electrochemistry MCQ Questions

44 Questions 88 Minutes
Answered: 0 / 44Unanswered: 44

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Question 1

The quantity of electricity needed to separately electrolyse 1 M solution of ZnSO4, AICl3 and AgNO3 completely is in the ratio of

Question 2

The values of limiting ionic conductance of H and HCOO– ions are respectively 347 and 53 S cm² mol-1 at 298 K. If the molar conductance of 0.025 M methanoic acid at 298 K is 40 S cm² mol-1, the dissociation constant of methanoic acid at 298 K is

Question 3

In a Leclanche dry cell, anode is:

Question 4

Point out the correct statement in a cell of zinc and copper:

Question 5

The charge on 1 gram mole ion of N3- is

Question 6

Which of the following statements is incorrect about electrochemical cell?

Question 7

Fe2+, Fe3+ and Fe blocks are kept together, then

Question 8

The solubility product of AgCl under standard conditions of temperature (298 K) is given by

Question 9

The limiting molar conductivities A° for NaCl, KBr and KCl are 126, 152 and 150 S cm² mol-1 respectively. The A° for NaBr is

Question 10

The units of conductivity are:

Question 11

Rust is a mixture of

Question 12

The standard electrode potentials for Pb2+/Pb and Zn2+/Zn are – 0.126 V and – 0.763 V respectively. The e.m.f. of the cell Zn | Zn2+ (0.1 M) | | Pb2+ (0.1 M) | Pb is:

Question 13

For a H2 – O2 fuel cell, the theoretical voltage has been found to be 1.23V and ΔH to be -285 kJ mol-1. The efficiency of the fuel cell is

Question 14

In infinite dilution of aqueous solution of BaCl2, molar conductivity of Ba2+ and Cl– ions are = 127.32 S cm²/mol and 76.34 S cm2/mol respectively. What is A°m for BaCI2 at same dilution?

Question 15

MCQ Questions for Class 12 Chemistry Chapter 3 Electrochemistry with Answers 1

Question 16

E°cell apd ΔG° are related as:

Question 17

If the conductivity and conductance of a solution is same then its cell constant is equal to:

Question 18

Aluminium displaces hydrogen from acids, but copper does not. A galvanic cell prepared by combining Cu/Cu2+ and Al/Al3+ has an emf of 2.0 V at 298 K. If the potential of copper electrode is + 0.34 V, that of aluminium electrode is

Question 19

Saturated solution of KNO3 is used to make salt bridge because

Question 20

λ(CICH2COONa) = 224 ohm-1 cm² gm eq-1, λ(NaCl) = 38.2 ohm-1 cm² gm eq-1. λ(HCl) = 203 ohm-1 cm² gm eq-1, what is the value of λ(CICH2COOH)?

Question 21

Same amount of electric current is passed through solution of AgNO3 and HCl. If 1.08 g of silver is obtained in the first case, the amount of hydrogen liberated at S.T.P. in the second case is:

Question 22

E°Cu2+/cu = 0.34 V and E°Zn2+/Zn = -0.76 V. A Daniell cell contains 0.1 M ZnSO4 solution and 0.01 M CuSO4 solution at its electrodes. The EMF of the cell is

Question 23

The ionisation constant of a weak electrolyte is 2.5 × 10-5 and molar conductance of its 0.01 M solution is 19.6 S cm² mol-1. The molar conductance at infinite dilution (S cm² mol-1) is

Question 24

Fe + 2Fe3+ → 3Fe2+ will be

Question 25

An electric current is passed through silver voltmeter connected to a water voltmeter. The cathode of silver voltmeter weighed 0.108 g more at the end of electrolysis. The volume of O2 at STP evolved is

Question 26

When concentration of ZnSO4 is 1.0 M and that of CuSO4 is 0.01 M, the e.m.f. changed to E2. What is the relationship between E1 and E2?

Question 27

The specific conductance of 0.1 M NaCl solution is 1.06 × 10-2 ohm-1 cm-1. Its molar conductance in ohm-1 cm² mol-1 is

Question 28

10800 C of electricity through the electrolyte deposited 2.977 g of metal with atomic mass 106.4 a.m.u. The valency of metal cation is:

Question 29

When lead storage battery discharges

Question 30

Cu(s) | Cu2+ (1M) | | Ag+ (1M) | Ag is 0.46 V. The standard reduction potential of Ag+|Ag is 0.80 V. The standard reduction potential of Cu2+ |Cu is

Question 31

Which of the following reaction occurs at anode during the recharging of lead storage battery?

Question 32

A current of 3A was passed through a solution of AuCl(_{ 4 }^{-}) ions using gold electrodes and it caused deposition of 1.234 g of Au (Atomic mass of Au = 197). The time for which the current was passed is

Question 33

Which of the following will be formed when lead storage battery is charged?

Question 34

Sn(s) + 2Ag+ (aq) → Sn2+ (aq) + 2 Ag(s)

Question 35

The resistance of 0.1 N solution of acetic acid is 250 ohm, when measured in a cell of cell constant 1.15 cm-1. The equivalent conductance (in ohm-1 cm² equivalent-1) of 0.1 N acetic acid is

Question 36

Sn(s)+2Fe3+(oq) → 2Fe2+(aq) + Sn2+(aq)is

Question 37

Number of coulombs required to deposit 90 g of Al when the electrode reaction Al3+ + 3e– → Al is:

Question 38

A zinc electrode is placed in 0.1 M solution of ZnSO4 at 25°C. Assuming that the salt is dissociated to an extent of 20% at this dilution, the potential of this electrode is (E° = -0.76V)

Question 39

In nickel-cadmium storage cell, the electrolyte is

Question 40

The limiting molar conductivities of HCl, CH3COONa and NaCl are respectively 425, 90 and 125 mho cm² mol-1 at 25 °C. The molar conductivity of 0.1 M CH3COOH solution is 7.8 mho cm² mol-1 at the same temperature. The degree of dissociation of 0.1 M acetic acid solution at the same temperature is

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