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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. Match the items of Column I and Column II.

electro53

a) A →4; B → 3; C → 5; D → 1

b) A →1; B → 4; C → 3; D → 2

c) A →3; B → 4; C → 5; D → 1

d) A →4; B → 3; C → 5; D → 2

2 / 25

2. 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

3 / 25

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

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

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

c) In electrochemical series, Zn is above hydrogen.

d) HNO₃ is weaker acid than H₂SO₄ and HCl

4 / 25

4. A gas 'X' at 1 atm is bubbled through a solution containing a mixture of 1M Y^-1 and 1M Z^-1 at 25°C. If the reduction potential of Z > Y > X, then:

a) Y will oxidize Z and not X

b) Y will oxidize X and not Z

c) Y will reduce both X and Z

d) Y will oxidize both Z and X

5 / 25

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

a) Cathode → Pure zinc; Anode → Pure copper

b) Cathode → Impure zinc; Anode → Impure sample

c) Cathode → Pure copper; Anode → Impure sample

d) Cathode → Impure sample; Anode → Pure copper

6 / 25

6. 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) Λ_m increases steeply on dilution near high concentration.

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

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

7 / 25

7. As a lead storage battery is charged:

a) Lead dioxide dissolves

b) Lead electrode becomes coated with lead sulphate

c) The concentration of sulphuric acid decreases.

d) Sulphuric acid is regenerated

8 / 25

8. The highest electrical conductivity of the following aqueous solutions is of:

a) 0.1 M acetic acid

b) 0.1 M fluoro acetic acid

c) 0.1 M chloroacetic acid

d) 0.1 M difluoro acetic acid

9 / 25

9. Statement I: Impure copper is converted into pure copper by electrolysis.
Statement II: Copper is dissolved at cathode and deposited at anode.

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

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

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

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

10 / 25

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

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

b) Hg is more inert than Pt.

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

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

11 / 25

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

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.

12 / 25

12. Statement I: Solid NaCl does not conduct electricity.
Statement II: Solid NaCl has no free ions.

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.

13 / 25

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

electro52

a) A →3; B → 4; C → 2; D → 1

b) A →4; B → 3; C → 1; D → 2

c) A →4; B → 3; C → 2; D → 1

d) A →3; B → 4; C → 1; D → 2

14 / 25

14. 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 → 2; C → 3

b) A →3; B → 1; C → 2

c) A →3; B → 2; C → 1

d) A →1; B → 3; C → 2

15 / 25

15. Conductivity (Unit Siemen's 'S') is directly proportional to area of the vessel and the concentration of the solution in it and is inversely proportional to the length of the vessel, then the unit of constant of proportionality is:

a) S m mol^-1

b) S m² mol^-1

c) S² m² mol^-2

d) S^-2 m² mol

16 / 25

16. Statement I: Copper sulphate solution is stored in zinc pot.
Statement II: Zinc is more reactive than copper, so it displaces copper from copper sulphate solution.

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 false, Statement II is true.

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

17 / 25

17. The electrode potentials for

Cu⁺² _(aq) + e^-1 → Cu⁺¹ _(aq₎ and

Cu⁺¹ _(aq) + e^-1 → Cu _(s₎, are + 0.15 V and +0.50 V respectively. The value of E° Cu⁺²/Cu will be

a) 0.325 V

b) 0. 650 V

c) 0.150 V

d) 0.500 V

18 / 25

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

elecro51

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

19 / 25

19. 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) 0.059 V

b) 0.118 V

c) 0.18 V

d) 0.59 V

20 / 25

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

If half-cell potentials are

fig Q7b

The cell potential will be:

a) 1. 34 V

b) 1.1 V

c) 0.84 V

d) 0.42 V

21 / 25

21. The reduction potential of hydrogen half-cell will be negative if:

a) p(H₂) = 2 atm and [H⁺] = 2.0 M

b) p(H₂) = 1 atm and [H⁺] = 1.0 M

c) p(H₂) = 1 atm and [H⁺] = 2.0 M

d) p(H₂) = 2 atm and [H⁺] = 1.0 M

22 / 25

22. 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) B^-, C^-, A^-

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

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

23 / 25

23. 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 NOT a 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 the correct explanation for Statement I.

24 / 25

24. 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 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.

25 / 25

25. Kohlrausch's law states that at:

a) Infinite dilution, each ion makes definite contribution to the equivalent conductance of an electrolyte, whatever be the nature of the other ion of the electrolyte.

b) Infinite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte depending on the nature of the other ion of the electrolyte.

c) Finite dilution, each ion makes definite contribution to the equivalent conductance of an electrolyte, whatever be the nature ofthe other ion ofthe electrolyte.

d) Infinite dilution, each ion makes definite contribution to conductance of an electrolyte, whatever be the nature of the other ion of the electrolyte.

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