Test: JEE Main 35 Year PYQs- Electrochemistry

Question 1

Conductivity (unit Siemen’s S) is directly proportional toarea of the vessel and the concentration of the solution in itand is inversely proportional to the length of the vesselthen the unit of the constant of proportionality is [2002]

Accepted Answer

Sm² mol^–1

Answer

Sm mol^–1

Answer

S^–2m² mol

Answer

S²m² mol^–2.

Question 2

EMF of a cell in terms of reduction potential of its left andright electrodes is [2002]

Accepted Answer

E = E_right - E_left

Answer

E = E_left - E_right

Answer

E = E_left + E_right

Answer

E = – (E_right + E_left).

Question 3

What will be the emf for the given cell [2002]
Pt | H₂ (P₁) | H⁺ (aq) | | H₂ (P₂) | Pt

Accepted Answer

Answer

Answer

Answer

None of these.

Question 4

Which of the following reaction is possible at anode?

Accepted Answer

Answer

F₂→ 2F^-

Answer

(1/2) O₂ + 2H⁺ → H₂O

Answer

None of these.

Question 5

When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are

[2002]

Accepted Answer

d

Answer

a

Answer

b

Answer

c

Question 6

Which of the following is a redox reaction? [2002]

Accepted Answer

Zn + 2AgCN → 2Ag + Zn(CN)₂.

Answer

NaCl + KNO₃ → NaNO₃ + KCl

Answer

CaC₂O₄ + 2HCl →CaCl₂ + H₂C₂O₄

Answer

Mg(OH)₂ + 2NH₄Cl →MgCl₂ + 2NH₄OH

Question 7

For a cell reaction involving a two-electron change, thestandard e.m.f. of the cell is found to be 0.295 V at 25ºC. The equilibrium constant of the reaction at 25ºC will be [2003

Accepted Answer

1 × 10¹⁰

Answer

29.5 × 10^–2

Answer

10]

Answer

1 × 10^–10

Question 8

Standard reduction electrode potentials of three metals A, B& C are respectively + 0.5 V, – 3.0 V & –1.2 V. The reducingpowers of these metals are [2003]

Accepted Answer

B > C > A

Answer

A > B > C

Answer

C > B > A

Answer

A > C > B

Question 9

When during electrolysis of a solution of AgNO₃ 9650coulombs of charge pass through the electroplating bath,the mass of silver deposited on the cathode will be

Accepted Answer

10.8 g

Answer

21.6 g [2003]

Answer

108 g

Answer

1.08 g

Question 10

For the redox reaction :
Zn(s) +Cu²⁺ (0.1M)→ Zn²⁺ (1M) + Cu(s) taking place in a cell, is 1.10 volt. E_cell for the cell will be [2003]

Accepted Answer

1.07 volt

Answer

1.80 volt

Answer

0.82 volt

Answer

2.14 volt

Question 11

Several blocks of magnesium are fixed to the bottom of a ship to [2003]

Accepted Answer

make the ship lighter

Answer

prevent action of water and salt

Answer

prevent puncturing by under-sea rocks

Answer

keep away the sharks

Question 12

In a hydrogen-oxygen fuel cell, combustion of hydrogenoccurs to [2004]

Accepted Answer

create potential difference between two electrodes

Answer

produce high purity water

Answer

generate heat

Answer

remove adsorbed oxygen from elctrode surfaces

Question 13

Consider the following Eº values

Under standard conditions the potential for the reaction

[2004]

Accepted Answer

0.91 V

Answer

1.40 V

Answer

1.68 V

Answer

0.63 V

Question 14

The standard e.m.f. of a cell involving one electron changeis found to be 0.591 V at 25ºC. The equilibrium constant ofthe reaction is (F = 96,500 C mol^–1; R = 8.314 JK^–1 mol^–1) [2004]

Accepted Answer

1.0 × 10¹⁰

Answer

1.0 × 10⁵

Answer

1.0 × 10¹

Answer

1.0 × 10³⁰

Question 15

The limiting molar conductivities Lº for NaCl, KBr and KClare 126, 152 and 150 S cm² mol^–1 respectively. The Lº forNaBr is [2004]

Accepted Answer

128 S cm² mol^–1

Answer

278 S cm² mol^–1

Answer

176 S cm² mol^–1

Answer

302 S cm² mol^–1

Question 16

In a cell that utilises the reaction Zn_(s) + 2H⁺ (aq) → Zn²⁺+ H_2(g) addition of H₂SO₄to cathode compartment, will [2004]

Accepted Answer

increase the E and shift equilibrium to the right

Answer

lower the E and shift equilibrium to the right

Answer

lower the E and shift equlibrium to the left

Answer

increase the E and shift equilibrium to the left

Question 17

The values for Cr, Mn, Fe and Co are – 0.41, + 1.57, + 0.77 and + 1.97V respectively. For which one of these
metals the change in oxidation state from +2 to +3 is easiest? [2004]

Accepted Answer

Cr

Answer

Fe

Answer

Mn

Answer

Co

Question 18

For a spontaneous reaction the DG, equilibrium constant (K) and will be respectively [2005]

Accepted Answer

–ve, >1, +ve

Answer

–ve, >1, –ve

Answer

–ve, <1, –ve

Answer

+ve, >1, –ve

Question 19

The highest electrical conductivity of the following aqueoussolutions is of [2005]

Accepted Answer

0.1 M difluoroacetic acid

Answer

0.1 M fluoroacetic acid

Answer

0.1 M chloroacetic acid

Answer

0.1 M acetic acid

Question 20

Aluminium oxide may be electrolysed at 1000°C to furnishaluminium metal (At. Mass = 27 amu; 1 Faraday = 96,500Coulombs). The cathode reaction is– Al³⁺ + 3e^- → Al° To prepare 5.12 kg of aluminium metal by this method werequire

Accepted Answer

5.49 × 10⁷ C of electricity

Answer

5.49 × 10¹ C of electricity

Answer

5.49 × 10⁴ C of electricity

Answer

1.83 × 10⁷ C of electricity

Question 21

Calculate using appropriate molar conductances of the electrolytes listed above at infinite dilution in H₂O
at 25°C

Accepted Answer

390.7

Answer

217.5

Answer

552.7

Answer

517.2

Question 22

Which of the following chemical reactions depict the oxidizing beahviour of H₂SO₄?

Accepted Answer

2HI + H₂SO₄ → I₂ + SO₂ + 2H₂O

Answer

NaCl + H₂SO₄ → NaHSO₄ + HCl

Answer

2PCl₅ + H₂SO₄ → 2POCl₃ + 2HCl + SO₂Cl₂

Answer

Ca(OH)₂ + H₂SO₄ → CaSO₄ + 2H₂O

Question 23

The molar conductivities and at infinite dilution in water at 25ºC are 91.0 and 426.2 S cm2/mol
respectively. To calculate , the additional value required is

Accepted Answer

Answer

Answer

Answer

Question 24

Resistance of a conductivity cell filled with a solution of an electrolyte of concentration 0.1 M is 100 W. The conductivity of this solution is 1.29 S m^–1. Resistance of the same cell when filled with 0.2 M of the same solution is 520 W. The molar conductivity of 0.2 M solution of electrolyte will be [2006]

Accepted Answer

12.4 × 10^–4 S m² mol^–1

Answer

1.24 × 10^–4 S m₂ mol^–1

Answer

124 × 10^–4 S m² mol^–1

Answer

1240 × 10^–4 S m² mol^–1

Question 25

The equivalent conductances of two strong electrolytes at infinite dilution in H₂O (where ions move freely through a
solution) at 25°C are given below : [2007]

What additional information/ quantity one needs to calculate of an aqueous solution of acetic acid?

Accepted Answer

<img src="https://cn.edurev.in/ApplicationImages/Temp/3066490_c85acf5c-af3f-4493-ba16-8a3bb410d910_lg.png" /> of NaCl

Answer

of chloroacetic acid (ClCH₂COOH)

Answer

of CH₃COOK

Answer

the limiting equivalent coductance of

Question 26

The cell, Zn | Zn²⁺ (1 M) || Cu²⁺ (1 M) | Cu was allowed to be completely discharged at 298 K. The relative
concentration of is [2007]

Accepted Answer

1037.3

Answer

9.65 × 10⁴

Answer

antilog (24.08)

Answer

37.3

Question 27

Given The potential for the cell Cr|Cr³⁺ (0.1M)|| Fe²⁺ (0.01 M)| Fe is [2008]

Accepted Answer

0.26 V

Answer

0.22 V

Answer

0.336 V

Answer

&ndash; 0.339

Question 28

In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is

At 298 K standard Gibb’s energies of formation for CH₃OH(l), H₂O(l) and and CO₂ (g) are –166.2, –237.2 and –394.4 kJ
mol^–1 respectively. If standard enthalpy of combustion of methonal is – 726 kJ mol^–1, efficiency of the fuel cell will be:

[2009]

Accepted Answer

97%

Answer

87%

Answer

90%

Answer

80%

Question 29

Given:

The value of standard electrode potential for the change, Fe³⁺ (aq) + e^– →Fe²⁺ (aq) will be:

[2009]

Accepted Answer

0.770 V

Answer

0.385 V

Answer

&ndash;0.270 V

Answer

&ndash;0.072 V

Question 30

The Gibbs energy for the decomposition of Al₂O₃ at 500°C is as follows :

The potential difference needed for electrolytic reductionof Al₂O₃ at 500°C is at least [2010]

Accepted Answer

- 2.5 V

Answer

4.5 V

Answer

3.0 V

Answer

5.0 V

JEE Main 35 Year PYQs- Electrochemistry - Free MCQ Test with solutions

MCQ Practice Test & Solutions: Test: JEE Main 35 Year PYQs- Electrochemistry (35 Questions)

Conductivity (unit Siemen’s S) is directly proportional toarea of the vessel and the concentration of the solution in itand is inversely proportional to the length of the vesselthen the unit of the constant of proportionality is [2002]

EMF of a cell in terms of reduction potential of its left andright electrodes is [2002]

What will be the emf for the given cell [2002]
Pt | H₂ (P₁) | H⁺ (aq) | | H₂ (P₂) | Pt

Which of the following reaction is possible at anode?

When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are
[2002]

Which of the following is a redox reaction? [2002]

For a cell reaction involving a two-electron change, thestandard e.m.f. of the cell is found to be 0.295 V at 25ºC. The equilibrium constant of the reaction at 25ºC will be [2003

Standard reduction electrode potentials of three metals A, B& C are respectively + 0.5 V, – 3.0 V & –1.2 V. The reducingpowers of these metals are [2003]

When during electrolysis of a solution of AgNO₃ 9650coulombs of charge pass through the electroplating bath,the mass of silver deposited on the cathode will be

For the redox reaction :
Zn(s) +Cu²⁺ (0.1M)→ Zn²⁺ (1M) + Cu(s) taking place in a cell, is 1.10 volt. E_cell for the cell will be [2003]

Several blocks of magnesium are fixed to the bottom of a ship to [2003]

In a hydrogen-oxygen fuel cell, combustion of hydrogenoccurs to [2004]

Consider the following Eº values
Under standard conditions the potential for the reaction
[2004]

The standard e.m.f. of a cell involving one electron changeis found to be 0.591 V at 25ºC. The equilibrium constant ofthe reaction is (F = 96,500 C mol^–1; R = 8.314 JK^–1 mol^–1) [2004]

The limiting molar conductivities Lº for NaCl, KBr and KClare 126, 152 and 150 S cm² mol^–1 respectively. The Lº forNaBr is [2004]

In a cell that utilises the reaction Zn_(s) + 2H⁺ (aq) → Zn²⁺+ H_2(g) addition of H₂SO₄to cathode compartment, will [2004]

The values for Cr, Mn, Fe and Co are – 0.41, + 1.57, + 0.77 and + 1.97V respectively. For which one of these
metals the change in oxidation state from +2 to +3 is easiest? [2004]

For a spontaneous reaction the DG, equilibrium constant (K) and will be respectively [2005]

The highest electrical conductivity of the following aqueoussolutions is of [2005]

Aluminium oxide may be electrolysed at 1000°C to furnishaluminium metal (At. Mass = 27 amu; 1 Faraday = 96,500Coulombs). The cathode reaction is– Al³⁺ + 3e^- → Al° To prepare 5.12 kg of aluminium metal by this method werequire

Calculate using appropriate molar conductances of the electrolytes listed above at infinite dilution in H₂O
at 25°C

Which of the following chemical reactions depict the oxidizing beahviour of H₂SO₄?

The molar conductivities and at infinite dilution in water at 25ºC are 91.0 and 426.2 S cm2/mol
respectively. To calculate , the additional value required is

The equivalent conductances of two strong electrolytes at infinite dilution in H₂O (where ions move freely through a
solution) at 25°C are given below : [2007]
What additional information/ quantity one needs to calculate of an aqueous solution of acetic acid?

The cell, Zn | Zn²⁺ (1 M) || Cu²⁺ (1 M) | Cu was allowed to be completely discharged at 298 K. The relative
concentration of is [2007]

Given The potential for the cell Cr|Cr³⁺ (0.1M)|| Fe²⁺ (0.01 M)| Fe is [2008]

Given:

The value of standard electrode potential for the change, Fe³⁺ (aq) + e^– →Fe²⁺ (aq) will be:
[2009]

The Gibbs energy for the decomposition of Al₂O₃ at 500°C is as follows :
The potential difference needed for electrolytic reductionof Al₂O₃ at 500°C is at least [2010]

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JEE Main 35 Year PYQs- Electrochemistry - Free MCQ Test with solutions

MCQ Practice Test & Solutions: Test: JEE Main 35 Year PYQs- Electrochemistry (35 Questions)

Conductivity (unit Siemen’s S) is directly proportional toarea of the vessel and the concentration of the solution in itand is inversely proportional to the length of the vesselthen the unit of the constant of proportionality is [2002]

EMF of a cell in terms of reduction potential of its left andright electrodes is [2002]

What will be the emf for the given cell [2002] Pt | H2 (P1) | H+ (aq) | | H2 (P2) | Pt

Which of the following reaction is possible at anode?

When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are[2002]

Which of the following is a redox reaction? [2002]

For a cell reaction involving a two-electron change, thestandard e.m.f. of the cell is found to be 0.295 V at 25ºC. The equilibrium constant of the reaction at 25ºC will be [2003

Standard reduction electrode potentials of three metals A, B& C are respectively + 0.5 V, – 3.0 V & –1.2 V. The reducingpowers of these metals are [2003]

When during electrolysis of a solution of AgNO3 9650coulombs of charge pass through the electroplating bath,the mass of silver deposited on the cathode will be

For the redox reaction : Zn(s) +Cu2+ (0.1M)→ Zn2+ (1M) + Cu(s) taking place in a cell, is 1.10 volt. Ecell for the cell will be [2003]

Several blocks of magnesium are fixed to the bottom of a ship to [2003]

In a hydrogen-oxygen fuel cell, combustion of hydrogenoccurs to [2004]

Consider the following Eº valuesUnder standard conditions the potential for the reaction [2004]

The standard e.m.f. of a cell involving one electron changeis found to be 0.591 V at 25ºC. The equilibrium constant ofthe reaction is (F = 96,500 C mol–1; R = 8.314 JK–1 mol–1) [2004]

The limiting molar conductivities Lº for NaCl, KBr and KClare 126, 152 and 150 S cm2 mol–1 respectively. The Lº forNaBr is [2004]

In a cell that utilises the reaction Zn(s) + 2H+ (aq) → Zn2++ H2(g) addition of H2SO4 to cathode compartment, will [2004]

The values for Cr, Mn, Fe and Co are – 0.41, + 1.57, + 0.77 and + 1.97V respectively. For which one of these metals the change in oxidation state from +2 to +3 is easiest? [2004]

For a spontaneous reaction the DG, equilibrium constant (K) and will be respectively [2005]

The highest electrical conductivity of the following aqueoussolutions is of [2005]

Aluminium oxide may be electrolysed at 1000°C to furnishaluminium metal (At. Mass = 27 amu; 1 Faraday = 96,500Coulombs). The cathode reaction is– Al3+ + 3e- → Al° To prepare 5.12 kg of aluminium metal by this method werequire

Calculate using appropriate molar conductances of the electrolytes listed above at infinite dilution in H2O at 25°C

Which of the following chemical reactions depict the oxidizing beahviour of H2SO4?

The molar conductivities and at infinite dilution in water at 25ºC are 91.0 and 426.2 S cm2/mol respectively. To calculate , the additional value required is

The equivalent conductances of two strong electrolytes at infinite dilution in H2O (where ions move freely through a solution) at 25°C are given below : [2007]What additional information/ quantity one needs to calculate of an aqueous solution of acetic acid?

The cell, Zn | Zn2+ (1 M) || Cu2+ (1 M) | Cu was allowed to be completely discharged at 298 K. The relative concentration of is [2007]

Given The potential for the cell Cr|Cr3+ (0.1M)|| Fe2+ (0.01 M)| Fe is [2008]

Given: The value of standard electrode potential for the change, Fe3+ (aq) + e– →Fe2+ (aq) will be: [2009]

The Gibbs energy for the decomposition of Al2O3 at 500°C is as follows :The potential difference needed for electrolytic reductionof Al2O3 at 500°C is at least [2010]

Chapter-wise Tests for JEE Main & Advanced

Chapter-wise Tests for JEE Main & Advanced

Top Courses for JEE

About this JEE Practice Test

Explore more JEE Study Resources

What will be the emf for the given cell [2002]
Pt | H₂ (P₁) | H⁺ (aq) | | H₂ (P₂) | Pt

When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are
[2002]

When during electrolysis of a solution of AgNO₃ 9650coulombs of charge pass through the electroplating bath,the mass of silver deposited on the cathode will be

For the redox reaction :
Zn(s) +Cu²⁺ (0.1M)→ Zn²⁺ (1M) + Cu(s) taking place in a cell, is 1.10 volt. E_cell for the cell will be [2003]

Consider the following Eº values
Under standard conditions the potential for the reaction
[2004]

The standard e.m.f. of a cell involving one electron changeis found to be 0.591 V at 25ºC. The equilibrium constant ofthe reaction is (F = 96,500 C mol^–1; R = 8.314 JK^–1 mol^–1) [2004]

The limiting molar conductivities Lº for NaCl, KBr and KClare 126, 152 and 150 S cm² mol^–1 respectively. The Lº forNaBr is [2004]

In a cell that utilises the reaction Zn_(s) + 2H⁺ (aq) → Zn²⁺+ H_2(g) addition of H₂SO₄to cathode compartment, will [2004]

The values for Cr, Mn, Fe and Co are – 0.41, + 1.57, + 0.77 and + 1.97V respectively. For which one of these
metals the change in oxidation state from +2 to +3 is easiest? [2004]

Aluminium oxide may be electrolysed at 1000°C to furnishaluminium metal (At. Mass = 27 amu; 1 Faraday = 96,500Coulombs). The cathode reaction is– Al³⁺ + 3e^- → Al° To prepare 5.12 kg of aluminium metal by this method werequire

Calculate using appropriate molar conductances of the electrolytes listed above at infinite dilution in H₂O
at 25°C

Which of the following chemical reactions depict the oxidizing beahviour of H₂SO₄?

The molar conductivities and at infinite dilution in water at 25ºC are 91.0 and 426.2 S cm2/mol
respectively. To calculate , the additional value required is

The equivalent conductances of two strong electrolytes at infinite dilution in H₂O (where ions move freely through a
solution) at 25°C are given below : [2007]
What additional information/ quantity one needs to calculate of an aqueous solution of acetic acid?

The cell, Zn | Zn²⁺ (1 M) || Cu²⁺ (1 M) | Cu was allowed to be completely discharged at 298 K. The relative
concentration of is [2007]

Given The potential for the cell Cr|Cr³⁺ (0.1M)|| Fe²⁺ (0.01 M)| Fe is [2008]

Given:

The value of standard electrode potential for the change, Fe³⁺ (aq) + e^– →Fe²⁺ (aq) will be:
[2009]

The Gibbs energy for the decomposition of Al₂O₃ at 500°C is as follows :
The potential difference needed for electrolytic reductionof Al₂O₃ at 500°C is at least [2010]