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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. 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) 0.500 V

b) 0.325 V

c) 0.150 V

d) 0. 650 V

2 / 25

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

a) p(H₂) = 1 atm and [H⁺] = 1.0 M

b) p(H₂) = 1 atm and [H⁺] = 2.0 M

c) p(H₂) = 2 atm and [H⁺] = 2.0 M

d) p(H₂) = 2 atm and [H⁺] = 1.0 M

3 / 25

3. 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 →3; B → 2; C → 4; D → 1

d) A →4; B → 3; C → 1; D → 2

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 both Z and X

b) Y will oxidize Z and not X

c) Y will reduce both X and Z

d) Y will oxidize X and not Z

5 / 25

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

a) 0.1 M difluoro acetic acid

b) 0.1 M chloroacetic acid

c) 0.1 M acetic acid

d) 0.1 M fluoro acetic acid

6 / 25

6. Two electrolytes X and Y are diluted. Λ _mof Y increases 1.5 times and for X it increases 25 times. Predict the strong electrolyte among X and Y.

a) Y

b) Both X and Y

c) X

d) There is no effect of dilution on nature of electrolyte

7 / 25

7. 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 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.

8 / 25

8. 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 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.

9 / 25

9. Statement I: The electrode may be negatively charged or positively charged, with respect to solution.
Statement II: Metal atom of electrode has tendency to go into solution as ion and leave behind the electron at the electrode.

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 NOT a correct explanation for statement-I.

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

10 / 25

10. At 25°C, molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9. 54 Ω ^-1cm² mol^-¹and at infinite dilution, its molar conductance is 238 Ω ^-1cm² mol^-¹. The degree of ionization of ammonium hydroxide at the same concentration and temperature is:

a) 4 .008 %

b) 20.800 %

c) 2.080 %

d) 40 .80 %

11 / 25

11. Select the correct statement

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

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

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

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

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 → Pure zinc; Anode → Pure copper

d) Cathode → Impure zinc; Anode → Impure sample

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 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.

14 / 25

14. Select the correct statement for the weak electrolyte:

a) Λ_m increases steeply on dilution near high concentration.

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

15 / 25

15. 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 >Z > X

b) Y > X > Z

c) Z > X > Y

d) X> Y > Z

16 / 25

16. 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

17 / 25

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

elecro51

a) A →4; B → 3; C → 2; D → 1

b) A →3; B → 4; C → 2; D → 1

c) A →4; B → 3; C → 1; D → 2

d) A →3; B → 4; C → 1; D → 2

18 / 25

18. As a lead storage battery is charged:

a) Lead dioxide dissolves

b) Sulphuric acid is regenerated

c) Lead electrode becomes coated with lead sulphate

d) The concentration of sulphuric acid decreases.

19 / 25

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

electro53

a) A →1; B → 4; C → 3; D → 2

b) A →4; B → 3; C → 5; D → 2

c) A →4; B → 3; C → 5; D → 1

d) A →3; B → 4; C → 5; D → 1

20 / 25

20. 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) S^-2 m² mol

d) S² m² mol^-2

21 / 25

21. 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)

22 / 25

22. 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

23 / 25

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

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 false.

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

24 / 25

24. 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 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.

25 / 25

25. 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) 2 and 1

b) 4 and 2

c) 3 and 2

d) 1 and 1

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