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Electrochemistry JEE

The Quiz is a JEE mains Level quiz containing 25 questions.

In 25 questions 15 questions are single choice, 6 questions are Assertion reasons type, 04 questions are Match the following type,

The time allotted for the quiz is 60 minutes.

The number of attempts remaining is 3

1 / 25

1. A button cell used in watches, functions as following

If half-cell potentials are

fig Q7b

The cell potential will be:

a) 0.84 V

b) 0.42 V

c) 1. 34 V

d) 1.1 V

2 / 25

2. Match the items of Column I and Column II on the basis of data given below.

electro48

a) A →3; B → 1; C → 5; D → 7; E → 4; F → 6; G → 2

b) A →3; B → 1; C → 5; D → 7; E → 2; F → 4; G → 6

c) A →3; B → 1; C → 7; D → 5; E → 4; F → 2; G → 6

d) A →1; B → 3; C → 5; D → 7; E → 4; F → 2; G → 6

3 / 25

3. Statement I: Pure water conducts electricity.
Statement II: It is unionized.

a) Statement I is true, Statement II is true; Statement II is the correct explanation for Statement I.

b) Statement I is true, Statement II is false.

c) Statement I is false, Statement II is true.

d) Statement I is true, Statement II is true; Statement II is NOT a correct explanation for statement-I.

4 / 25

4. electro18

Calculate the limiting molar conductivity of NaCl and KBr from the above table.

a) NaCl → 126.4; KBr → 150.6

b) NaCl → 151.6; KBr → 126.4

c) NaCl → 126.4; KBr → 151.6

d) NaCl → 150.6; KBr → 126.4

5 / 25

5. Select the correct statement

a) Conductivity increases but molar conductivity decreases with increase in dilution.

b) Conductivity decreases but molar conductivity increases with increase in concentration.

c) Conductivity as well as molar conductivity decrease with decrease in concentration.

d) Conductivity decreases but molar conductivity increases with increase in dilution.

6 / 25

6. The graph of molar conductivity versus √C is plotted.

electro14

Which type of electrolyte are used in A and B ?

a) A→ Weak electrolyte; B→ Strong electrolyte

b) A→ Strong electrolyte; B→ Strong electrolyte

c) A→ Strong electrolyte; B→ Weak electrolyte

d) A→ Weak electrolyte; B→ Weak electrolyte

7 / 25

7. Statement I: Conductivity of electrolytes decreases when dissolved in water.
Statement II: They furnish their own ions.

a) Statement I is true, Statement II is true; Statement II is NOT a correct explanation for statement-I.

b) Statement I is true, Statement II is true; Statement II is the correct explanation for Statement I.

c) Statement I is false, Statement II is true.

d) Statement I is true, Statement II is false.

8 / 25

8. Consider the following cell reaction

electro06

the cell potential at 25°C is:

a) 1.77 V

b) 1.87 V

c) 1.47 V

d) 1.57 V

9 / 25

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

a) Cathode → Impure zinc; Anode → Impure sample

b) Cathode → Pure zinc; Anode → Pure copper

c) Cathode → Impure sample; Anode → Pure copper

d) Cathode → Pure copper; Anode → Impure sample

10 / 25

10. Match the items of Column I and Column II.

electro52

a) A →4; B → 3; C → 1; D → 2

b) A →3; B → 4; C → 1; D → 2

c) A →3; B → 4; C → 2; D → 1

d) A →4; B → 3; C → 2; D → 1

11 / 25

11. Select the correct statement for the weak electrolyte:

a) The change in Λ_m with dilution is due to decrease in the degree of dissociation and number of ions in the solution that contain electrolyte.

b) They have higher degree of dissociation at higher concentration.

c) Λ_m increases steeply on dilution near high concentration.

d) At infinite dilution, electrolyte dissociate completely but at such low concentration the conductivity of solution is low and cannot be measured accurately.

12 / 25

12. If the E^°_cellfor a given reaction has a negative value, then which of the following gives the correct relationships for the values of ∆G^° and K_eq?

a) ∆G^o< 1; K_eq > 1

b) ∆G^o> 1; K_eq < 1

c) ∆G^o< 1; K_eq < 1

d) ∆G^o< 1; K_eq > 1

13 / 25

13. Statement I: A solution of Ni(NO₃)₂ is electrolyzed between platinum electrodes using current of 5 A for 20 minutes. The weight of Ni deposited is 1.825 g.
Statement II: The mass of substance deposited during the electrolysis of an electrolyte is inversely proportional to the quantity of electricity passed through the electrolyte.

a) Statement I is true, Statement II is false.

b) Statement I is true, Statement II is true; Statement II is the correct explanation for Statement I.

c) Statement I is false, Statement II is true.

d) Statement I is true, Statement II is true; Statement II is NOT a correct explanation for statement-I.

14 / 25

14. Statement I: Conductivity of pure water is 3.5 x 10^-5 S m⁻¹
Statement II: High amounts of hydrogen and hydroxyl ions are present in water.

a) Statement I is true, Statement II is true; Statement II is the correct explanation for Statement I.

b) Statement I is true, Statement II is true; Statement II is NOT a correct explanation for statement-I.

c) Statement I is true, Statement II is false.

d) Statement I is false, Statement II is true.

15 / 25

15. Zn gives H₂ gas with H₂SO₄ and HCl but not with HNO₃ because:

a) In electrochemical series, Zn is above hydrogen.

b) Zn acts as oxidizing agent when reacts with HNO₃.

c) NO₃^-1 is reduced in preference to hydronium ion.

d) HNO₃ is weaker acid than H₂SO₄ and HCl

16 / 25

16. Statement I: Platinum and gold are used as inert electrodes.
Statement II: Pt and Au do not participate in the reaction and provide the surface for oxidation or reduction.

a) Statement I is true, Statement II is true; Statement II is the correct explanation for Statement I.

b) Statement I is true, Statement II is false.

c) Statement I is true, Statement II is true; Statement II is NOT a correct explanation for statement-I.

d) Statement I is false, Statement II is true.

17 / 25

17. A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl and pH =10 and, by passing hydrogen gas around the platinum wire at 1 atm pressure. The oxidation potential of electrode would be:

a) 0.118 V

b) 0.059 V

c) 0.59 V

d) 0.18 V

18 / 25

18. Resistance of 0.2 M solution of an electrolyte is 50Ω. The specific conductance of the solution is 1.3 S m ^-1. If resistance of the 0.4 M solution of the same electrolyte is 260 Ω, its molar conductivity is :

a) 62.5 S m² mol^-1

b) 625 x 10^-4 S m² mol^-1

c) 6.25 x 10^-4 S m² mol^-1

d) 6250 S m² mol^-1

19 / 25

19. For the generation of electrical potential of 1.1 V, the ideal concentration of zinc and copper ion (in mol dm ^-3) in the Galvanic cell is :

a) 4 and 2

b) 3 and 2

c) 2 and 1

d) 1 and 1

20 / 25

20. The Gibbs energy for the decomposition of Al₂O₃at 500°C is as follows:

electro10

The potential difference needed for the electrolytic

reduction of Aluminum oxide (Al₂O₃) at 500°C is:

atleast

a) 5.0 V

b) 4.5 V

c) 2.5 V

d) 3.0 V

21 / 25

21. Compound XA XB XC, are added into separate test tubes containing A, B, C solutions. XB react with A and C. XA does not react with any of these. XC reacts with A. Arrange the anion in the decreasing order of their oxidation.

a) B^-, A^-, C^-

b) A^-, B^-, C^-

c) B^-, C^-, A^-

d) C^-, A^-, B^-

22 / 25

22. Match the terms given in Column I with the units given in Column II.

electro50

a) A →3; B → 4; C → 1; D → 2

b) A →4; B → 3; C → 2; D → 1

c) A →3; B → 4; C → 2; D → 1

d) A →4; B → 3; C → 1; D → 2

23 / 25

23. In electrolysis of NaCl when Pt electrode is taken then H₂ is liberated at cathode while with Hg cathode it forms sodium amalgam:

a) More voltage is required to reduce at Hg than at Pt.

b) Hg is more inert than Pt.

c) Na is dissolved in Hg while it does not dissolve in Pt.

d) Concentration ofF ions is larger when Pt electrode is taken.

24 / 25

24. Match the following Column I with type of electrolyte in Column II and choose the correct option from the codes given below.

Electro46

a) A →1; B → 3; C → 2

b) A →1; B → 2; C → 3

c) A →3; B → 1; C → 2

d) A →3; B → 2; C → 1

25 / 25

25. Statement I: DC cannot be used during measurement of resistance of an ionic solution.
Statement II: DC changes the composition of solution and solution cannot be connected to the bridge like metallic wire.

a) Statement I is true, Statement II is false.

b) Statement I is true, Statement II is true; Statement II is the correct explanation for Statement I.

c) Statement I is true, Statement II is true; Statement II is NOT a correct explanation for statement-I.

d) Statement I is false, Statement II is true.

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