Class 12 Chemistry - Chapter 3: Electrochemistry MCQ Questions

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Your Class 12 Chemistry Study Path

Question 1

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

A 2 : 2 : 1

B 2 : 1 : 3

C 2 : 1 : 1

D 2 : 3 : 1

Question 2

The values of limiting ionic conductance of H and HCOO^– ions are respectively 347 and 53 S cmÂ² mol^-1 at 298 K. If the molar conductance of 0.025 M methanoic acid at 298 K is 40 S cmÂ² mol^-1, the dissociation constant of methanoic acid at 298 K is

A 2.5 Ã— 10^-4

B 1.5 Ã— 10^-4

C 2 Ã— 10^-5

D 1 Ã— 10^-5

Question 3

In a Leclanche dry cell, anode is:

A MnO₂ + C

B Zinc container

C FeO and Fe(OH)₂

D Graphite rod

Question 4

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

A The flow of electrons is from copper to zinc.

B The standard reduction potential of zinc is more than that of copper.

C Zinc acts as anode and copper as cathode.

D Zinc acts as cathode and copper as anode.

Question 5

The charge on 1 gram mole ion of N^3- is

A 4.89 Ã— 10⁵ C

B 3.98 Ã— 10⁵ C

C 2.89 Ã— 10⁵ C

D 6.00 Ã— 10⁵ C

Question 6

Which of the following statements is incorrect about electrochemical cell?

A Cell can work indefinitely.

B Salt bridge maintains the electrical neutrality of the electrolytes.

C Chemical energy is converted into electrical energy.

D Electrons are released at anode.

Question 7

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

A Fe²⁺ decreases

B Fe²⁺ |Fe³⁺ remains unchanged

C Fe³⁺ decreases

D Fe³⁺ increases

Question 8

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

A 1.5 Ã— 10^-10

B 3.2 Ã— 10^-10

C 1.5 Ã— 10^-8

D 1.6 Ã— 10^-5

Question 9

The limiting molar conductivities AÂ° for NaCl, KBr and KCl are 126, 152 and 150 S cmÂ² mol^-1 respectively. The AÂ° for NaBr is

A 302 S cmÂ² mol^-1

B 128 S cmÂ² mol^-1

C 976 S cmÂ² mol^-1

D 278 S cmÂ² mol^-1

Question 10

The units of conductivity are:

A ohm^-1 cmÂ²

B ohm^-2 cmÂ² equiv^-1

C ohm^-1 cm^-1

D ohm^-1

Question 11

Rust is a mixture of

A Fe₃O₄ and Fe(OH)₃.

B Fe₂O₃ and Fe(OH)₃

C FeO and Fe(OH)₂

D FeO and Fe(OH)₃

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:

A 0.889 V.

B > 0.637 V

C < 0.637 V

D 0.637 V

Question 13

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

A 72%

B 89%

C 83%

D 76%

Question 14

In infinite dilution of aqueous solution of BaCl₂, molar conductivity of Ba²⁺ and Cl^– ions are = 127.32 S cmÂ²/mol and 76.34 S cm2/mol respectively. What is AÂ°m for BaCI2 at same dilution?

A 203.6 S cmÂ² mol^-1

B 90.98 S cmÂ² mol^-1

C 330.98 S cmÂ² mol^-1

D 280 S cmÂ² mol^-1

Question 15

A -0.65 V

B 0.325 V

C 0.65 V

D 0.35 V

Question 16

EÂ°_cell apd Î”GÂ° are related as:

A Î”GÂ° = nF EÂ°_cell = 0.

B Î”GÂ° = -nF EÂ°_cell

C Î”G = -nF EÂ°_cell

D Î”GÂ° = nF EÂ°_cell

Question 17

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

A 1000

B 10

D 1

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

A 1.66 V

B -1.66 V

C +2.34 V

D -2.3 V

Question 19

Saturated solution of KNO₃ is used to make salt bridge because

A KNO₃ is highly soluble in water.

B velocity of both K+ and NO(_3^-) are nearly the same

C velocity of NO(_3^-) is greater than that of K⁺

D velocity of K⁺ is greater than that of NO(_3^-)

Question 20

Î»(CICH₂COONa) = 224 ohm^-1 cmÂ² gm eq^-1, Î»(NaCl) = 38.2 ohm^-1 cmÂ² gm eq^-1. Î»(HCl) = 203 ohm^-1 cmÂ² gm eq^-1, what is the value of Î»(CICH₂COOH)?

A 59.5 ohm^-1 cmÂ² gm eq^-1

B 388.8 ohm^-1 cmÂ² gm eq^-1

C 289.5 ohm^-1 cmÂ² gm eq^-1

D 288.5 ohm^-1 cmÂ² gm eq^-1

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:

A 1.008 g

B 224 cmÂ³

C 22400 cmÂ³

D 112 cmÂ³

Question 22

EÂ°_Cu²⁺/cu = 0.34 V and EÂ°_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

A 1.07 V

B 1.16 V

C 1.04 V

D 1.10 V

Question 23

The ionisation constant of a weak electrolyte is 2.5 Ã— 10^-5 and molar conductance of its 0.01 M solution is 19.6 S cmÂ² mol^-1. The molar conductance at infinite dilution (S cmÂ² mol^-1) is

A 39.2

B 306

C 392

D 402

Question 24

Fe + 2Fe³⁺ â†’ 3Fe²⁺ will be

A 0.330 V

B 0.111 V

C 1.212 V

D 1.653 V

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

A 11.2 cmÂ³

B 22.4 cmÂ³

C 550 cmÂ³

D 5.6 cmÂ³

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?

A E₂ = 0 â‰ E₁

B E₁ = E₂

C E₁ < E₂

D E₁ > E₂

Question 27

The specific conductance of 0.1 M NaCl solution is 1.06 Ã— 10^-2 ohm^-1 cm^-1. Its molar conductance in ohm^-1 cmÂ² mol^-1 is

A 53

B 1.06 Ã— 10⁴

C 1.06 Ã— 10Â³

D 1.06 Ã— 10Â²

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:

A 1

B 2

C 3

D 4

Question 29

When lead storage battery discharges

A H₂SO₄ is consumed.

B Lead is formed

C PbSO₄ is consumed

D SO₂ is evolved

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

A 0.34 V

B -1.26 V

C 1.26 V

D -0.34 V

Question 31

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

A PbO₂ + 4H⁺ + SO(_{ 4 }^{2-}) + 2e^– â†’ PbSO₄ + 2H₂O

B PbSO₄ + 2e^– â†’ Pb + S0(_{ 4 }^{2-})

C Pb + S0(_{ 4 }^{2-}) â†’ PbSO₄ + 2e^–

D PbSO₄ + 2H₂O â†’ PbO₂ + SO(_{ 4 }^{2-}) +4H⁺ + 2e^–

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

A 10 min 40s

B 10 min 4s

C 30 min 12s

D 20 min 8s

Question 33

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

A lead sulphate is formed.

B sulphuric acid is formed

C lead is consumed

D Sulphuric add is consumed

Question 34

Sn(s) + 2Ag⁺ (aq) â†’ Sn²⁺ (aq) + 2 Ag(s)

A None of the above.

B increase in the concentration of Ag⁺ ions

C increase in the concentration of Sn²⁺ ions

D increase in the size of silver rod

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 cmÂ² equivalent^-1) of 0.1 N acetic acid is

A 9.2

B 46

C 0.023

D 18.4

Question 36

Sn(s)+2Fe³⁺(oq) â†’ 2Fe²⁺(aq) + Sn²⁺(aq)is

A 0.63 V

B 1.68 V

C 1.40 V

D 0.91 V

Question 37

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

A 6.955 Ã— 10⁴

B 9.65 Ã— 10⁵

C 8.685 Ã— 10⁵

D 9.65 Ã— 10⁴

Question 38

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

A 0.79 V

B 0.81 V

C – 0.79 V

D – 0.81 V

Question 39

In nickel-cadmium storage cell, the electrolyte is

A Ni(OH)₃(aq)

B aqueous NH₄Cl

C dil H₂SO₄

D moist KOH

Question 40

The limiting molar conductivities of HCl, CH₃COONa and NaCl are respectively 425, 90 and 125 mho cmÂ² mol^-1 at 25 Â°C. The molar conductivity of 0.1 M CH₃COOH solution is 7.8 mho cmÂ² mol^-1 at the same temperature. The degree of dissociation of 0.1 M acetic acid solution at the same temperature is

A 0.03

B 0.15

C 0.02

D 0.10

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Class 12 Chemistry - Chapter 3: Electrochemistry MCQ Questions

Your Class 12 Chemistry Study Path

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

The values of limiting ionic conductance of H and HCOO– ions are respectively 347 and 53 S cmÂ² mol-1 at 298 K. If the molar conductance of 0.025 M methanoic acid at 298 K is 40 S cmÂ² mol-1, the dissociation constant of methanoic acid at 298 K is

In a Leclanche dry cell, anode is:

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

The charge on 1 gram mole ion of N3- is

Which of the following statements is incorrect about electrochemical cell?

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

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

The limiting molar conductivities AÂ° for NaCl, KBr and KCl are 126, 152 and 150 S cmÂ² mol-1 respectively. The AÂ° for NaBr is

The units of conductivity are:

Rust is a mixture of

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:

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

In infinite dilution of aqueous solution of BaCl2, molar conductivity of Ba2+ and Cl– ions are = 127.32 S cmÂ²/mol and 76.34 S cm2/mol respectively. What is AÂ°m for BaCI2 at same dilution?

EÂ°cell apd Î”GÂ° are related as:

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

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

Saturated solution of KNO3 is used to make salt bridge because

Î»(CICH2COONa) = 224 ohm-1 cmÂ² gm eq-1, Î»(NaCl) = 38.2 ohm-1 cmÂ² gm eq-1. Î»(HCl) = 203 ohm-1 cmÂ² gm eq-1, what is the value of Î»(CICH2COOH)?

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:

EÂ°Cu2+/cu = 0.34 V and EÂ°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

The ionisation constant of a weak electrolyte is 2.5 Ã— 10-5 and molar conductance of its 0.01 M solution is 19.6 S cmÂ² mol-1. The molar conductance at infinite dilution (S cmÂ² mol-1) is

Fe + 2Fe3+ â†’ 3Fe2+ will be

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

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?

The specific conductance of 0.1 M NaCl solution is 1.06 Ã— 10-2 ohm-1 cm-1. Its molar conductance in ohm-1 cmÂ² mol-1 is

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:

When lead storage battery discharges

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

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

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

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

Sn(s) + 2Ag+ (aq) â†’ Sn2+ (aq) + 2 Ag(s)

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 cmÂ² equivalent-1) of 0.1 N acetic acid is

Sn(s)+2Fe3+(oq) â†’ 2Fe2+(aq) + Sn2+(aq)is

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

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

In nickel-cadmium storage cell, the electrolyte is

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

The values of limiting ionic conductance of H and HCOO^– ions are respectively 347 and 53 S cmÂ² mol^-1 at 298 K. If the molar conductance of 0.025 M methanoic acid at 298 K is 40 S cmÂ² mol^-1, the dissociation constant of methanoic acid at 298 K is

The charge on 1 gram mole ion of N^3- is

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

The limiting molar conductivities AÂ° for NaCl, KBr and KCl are 126, 152 and 150 S cmÂ² mol^-1 respectively. The AÂ° for NaBr is

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:

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

In infinite dilution of aqueous solution of BaCl₂, molar conductivity of Ba²⁺ and Cl^– ions are = 127.32 S cmÂ²/mol and 76.34 S cm2/mol respectively. What is AÂ°m for BaCI2 at same dilution?

EÂ°_cell apd Î”GÂ° are related as:

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

Saturated solution of KNO₃ is used to make salt bridge because

Î»(CICH₂COONa) = 224 ohm^-1 cmÂ² gm eq^-1, Î»(NaCl) = 38.2 ohm^-1 cmÂ² gm eq^-1. Î»(HCl) = 203 ohm^-1 cmÂ² gm eq^-1, what is the value of Î»(CICH₂COOH)?

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:

EÂ°_Cu²⁺/cu = 0.34 V and EÂ°_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

The ionisation constant of a weak electrolyte is 2.5 Ã— 10^-5 and molar conductance of its 0.01 M solution is 19.6 S cmÂ² mol^-1. The molar conductance at infinite dilution (S cmÂ² mol^-1) is

Fe + 2Fe³⁺ â†’ 3Fe²⁺ will be

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

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?

The specific conductance of 0.1 M NaCl solution is 1.06 Ã— 10^-2 ohm^-1 cm^-1. Its molar conductance in ohm^-1 cmÂ² mol^-1 is

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

Sn(s) + 2Ag⁺ (aq) â†’ Sn²⁺ (aq) + 2 Ag(s)

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 cmÂ² equivalent^-1) of 0.1 N acetic acid is

Sn(s)+2Fe³⁺(oq) â†’ 2Fe²⁺(aq) + Sn²⁺(aq)is

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

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