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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. KCl solution is generally used to determine the cell constant because:

a) All of these reasons.

b) Its conductivity is known accurately at various concentration and different temperatures.

c) Size of cations and anion are comparable

d) It is highly ionic in nature.

2 / 25

2. Consider the following cell reaction

electro06

the cell potential at 25°C is:

a) 1.87 V

b) 1.47 V

c) 1.77 V

d) 1.57 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 oxidize X and not Z

b) Y will reduce both X and Z

c) Y will oxidize Z and not X

d) Y will oxidize both Z and X

4 / 25

4. 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) 6250 S m² mol^-1

c) 625 x 10^-4 S m² mol^-1

d) 6.25 x 10^-4 S m² mol^-1

5 / 25

5. 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 true; Statement II is the correct explanation for Statement I.

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

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.

6 / 25

6. Match the following Column I with units given in Column II and choose the correct option from the codes given below.

electro44

a) A →1; B → 3; C → 2

b) A →2; B → 1; C → 3

c) A →1; B → 2; C → 3

d) A →2; B → 3; C → 1

7 / 25

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

electro52

a) A →3; B → 4; C → 1; D → 2

b) A →4; B → 3; C → 2; D → 1

c) A →4; B → 3; C → 1; D → 2

d) A →3; B → 4; C → 2; D → 1

8 / 25

8. 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→ Weak electrolyte

b) A→ Strong electrolyte; B→ Strong electrolyte

c) A→ Strong electrolyte; B→ Weak electrolyte

d) A→ Weak electrolyte; B→ Strong electrolyte

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 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.

10 / 25

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

a) HNO₃ is weaker acid than H₂SO₄ and HCl

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

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

d) In electrochemical series, Zn is above hydrogen.

11 / 25

11. 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 m² mol^-1

b) S^-2 m² mol

c) S² m² mol^-2

d) S m mol^-1

12 / 25

12. 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 false, Statement II is true.

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.

13 / 25

13. electro18

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

a) NaCl → 151.6; KBr → 126.4

b) NaCl → 150.6; KBr → 126.4

c) NaCl → 126.4; KBr → 151.6

d) NaCl → 126.4; KBr → 150.6

14 / 25

14. 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) 2 x96500 C

c) 96.50 C

d) 96500 C

15 / 25

15. Molar conductivities (Λ^°_m) at infinite dilution of NaCl, HCl and CH₃COONa are 126.4, 425.9 and 91.0 S cm² mol^-1respectively. Λ^°_mfor CH₃COOH will be

a) 425.5 S cm² mol^-1

b) 290.85 S cm² mol^-1

c) 390.5 S cm² mol^-1

d) 180.5 S cm² mol^-1

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 →4; B → 1; C → 3; D → 2

c) A →4; B → 3; C → 1; D → 2

d) A →3; B → 2; C → 4; D → 1

17 / 25

17. Consider the following graph.

electro15

Here the limiting molar conductivity is:

a) 150

b) 148.6

c) 147

d) 87.46

18 / 25

18. 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 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 true, Statement II is false.

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

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 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.

20 / 25

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

a) 0.1 M fluoro acetic acid

b) 0.1 M difluoro acetic acid

c) 0.1 M acetic acid

d) 0.1 M chloroacetic acid

21 / 25

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

elecro51

a) A →3; B → 4; C → 1; D → 2

b) A →4; B → 3; C → 1; D → 2

c) A →3; B → 4; C → 2; D → 1

d) A →4; B → 3; C → 2; D → 1

22 / 25

22. Select the correct statement for the weak electrolyte:

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

b) 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.

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

d) Λ_m increases steeply on dilution near high concentration.

23 / 25

23. 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 false, Statement II is true.

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

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

24 / 25

24. 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

25 / 25

25. As a lead storage battery is charged:

a) Sulphuric acid is regenerated

b) Lead electrode becomes coated with lead sulphate

c) Lead dioxide dissolves

d) The concentration of sulphuric acid decreases.

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