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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. 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.

2 / 25

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

If half-cell potentials are

fig Q7b

The cell potential will be:

a) 0.42 V

b) 0.84 V

c) 1.1 V

d) 1. 34 V

3 / 25

3. 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 reduce both X and Z

b) Y will oxidize Z and not X

c) Y will oxidize both Z and X

d) Y will oxidize X and not Z

4 / 25

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

a) 0.1 M difluoro acetic acid

b) 0.1 M fluoro acetic acid

c) 0.1 M chloroacetic acid

d) 0.1 M acetic acid

5 / 25

5. When 0.1 mole of MnO₄²^-is oxidized, the quantity of electricity required to completely oxidize MnO₄ ²^-to MnO₄^-1is:

a) 9650 C

b) 96500 C

c) 96.50 C

d) 2 x96500 C

6 / 25

6. 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 →3; B → 2; C → 1

b) A →3; B → 1; C → 2

c) A →1; B → 2; C → 3

d) A →1; B → 3; C → 2

7 / 25

7. Consider the following graph.

electro15

Here the limiting molar conductivity is:

a) 147

b) 87.46

c) 150

d) 148.6

8 / 25

8. 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 →1; B → 3; C → 5; D → 7; E → 4; F → 2; G → 6

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

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

9 / 25

9. Kohlrausch's law states that at:

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

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

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

d) 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.

10 / 25

10. 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→ Weak electrolyte; B→ Weak electrolyte

c) A→ Strong electrolyte; B→ Strong electrolyte

d) A→ Strong electrolyte; B→ Weak electrolyte

11 / 25

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

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.

12 / 25

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

a) Cathode → Impure sample; Anode → Pure copper

b) Cathode → Pure copper; Anode → Impure sample

c) Cathode → Impure zinc; Anode → Impure sample

d) Cathode → Pure zinc; Anode → Pure copper

13 / 25

13. Standard electrode potential of three metals X, Y and Z are - + 1 2. V, 0. 5V and -30. V respectively. The reducing power of these metals will be:

a) Y > X > Z

b) Y >Z > X

c) X> Y > Z

d) Z > X > Y

14 / 25

14. 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

15 / 25

15. Statement I: Conductivity always increases with decrease in concentration for strong and weak electrolytes.
Statement II: Number of ions per unit volume decreases on dilution.

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.

16 / 25

16. Match the following Column I (expressions) with Column II and choose the correct option from the codes given below.

Electro45

a) A →3; B → 4; C → 2; D → 1

b) A →3; B → 2; C → 4; D → 1

c) A →4; B → 3; C → 1; D → 2

d) A →4; B → 1; C → 3; D → 2

17 / 25

17. 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.

18 / 25

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

a) p(H₂) = 2 atm and [H⁺] = 2.0 M

b) p(H₂) = 2 atm and [H⁺] = 1.0 M

c) p(H₂) = 1 atm and [H⁺] = 2.0 M

d) p(H₂) = 1 atm and [H⁺] = 1.0 M

19 / 25

19. Statement I: Anhyd. HCl is bad conductor of electricity, while aq. HCl is good conductor.
Statement II: Aqueous HCl is not fully ionized but, Anhyd. HCl is ionized to produce H⁺¹ and Cl^-1 .

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

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 true, Statement II is false.

20 / 25

20. Match the terms given in Column I with the items given in Column II.

Fig Q49

a) A →1; B → 4; C → 3; D → 2

b) A →4; B → 1; C → 2; D → 3

c) A →4; B → 1; C → 3; D → 2

d) A →1; B → 4; C → 2; D → 3

21 / 25

21. electro18

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

a) NaCl → 150.6; KBr → 126.4

b) NaCl → 151.6; KBr → 126.4

c) NaCl → 126.4; KBr → 150.6

d) NaCl → 126.4; KBr → 151.6

22 / 25

22. 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 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.

23 / 25

23. 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 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.

24 / 25

24. Which of the following equation(s) is/are incorrect?

a) None of the options mentioned.

b) Λ^°_m(KCl)- Λ^°_m(NaCl)= Λ^°_m(KBr)- Λ^°_m(NaBr)

c) Λ^°_m(KBr)- Λ^°_m(NaBr)= Λ^°_m(KI)- Λ^°_m(NaI)

d) Λ^°_m(NaBr)- Λ^°_m(NaCl)= Λ^°_m(KBr)- Λ^°_m(KCl)

25 / 25

25. 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^-2 m² mol

b) S m mol^-1

c) S m² mol^-1

d) S² m² mol^-2

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