MCQs of Electrochemistry

Electrochemistry MCQs

MCQs of Electrochemistry

Showing 51 to 60 out of 158 Questions

51.

One Daniell cell contains 1 M ZnSO₄ and 1 M CuSO₄ solutions in anode and cathode half cells respectively. Another Daniell cell contains 2 M ZnSO₄ and 2 M CuSO₄ solutions in anode and cathode half cells respectively. if their standard cell potentials are respectively E₁ and E₂ V, then _____ .

(a)	E₁ = 2E₂
(b)	E₂ = 2E₁
(c)	E₂ = 4E₁
(d)	E₁ = E₂

52.

What are the conditions for the reaction to be spontaneous in an electrochemical cell ?

(a)	E°_cell > 0, ΔG° > 0, K_C < 1
(b)	E°_cell > 0, ΔG° < 0, K_C = 1
(c)	E°_cell > 0, ΔG° < 0, K_C > 1
(d)	E°_cell < 0, ΔG° > 0, K_C = 0

53.

Represent the cell formed by combination of copper half cell with hydrogen electrode. E°_{Cu²⁺ Ι Cu} = 0.34 V;

(a)	Cu Ι Cu²⁺_{(1 M)} ΙΙ H⁺_{(1 M)}ΙH_{2(1 bar)}Ι Pt
(b)	Pt Ι H_{2(1 bar)} ΙΙ H⁺_{(1 M)}ΙCu²⁺_(1M)Ι Cu
(c)	Pt Ι H₂Ι H⁺_{(1 M)}ΙΙ CuΙ Cu²⁺_(1M)
(d)	Cu_(s) Ι Cu²⁺_{(1 M)} ΙΙ H_2(g)Ι Pt Ι 2H⁺_{(1 M)}

54.

Which of the following reaction occurs at cathode during the discharging of lead storage cell ?

(a)	PbSO₄ + 2e^- → Pb + SO₄^2-
(b)	PbSO_4(s)+ 2H₂O→ PbO₂ + 4H⁺ + SO₄^2-
(c)	PbO_2(s)+ 4H⁺_(aq)+ SO₄^2-_(aq) + 2e^-→ PbSO_4(S) + 2H₂O
(d)	None of these

55.

For the cell reaction :

Cu²⁺_(aq)+ Zn(s) →Zn²⁺_(aq) +Cu_(s)

(C₁) (C₂)

free energy change (ΔG) is a function of which ?

(a)	ln(C₁ + C₂)
(b)	$\ln \frac{C_{1}}{C_{2}}$
(c)	$\ln \frac{C_{2}}{C_{1}}$
(d)	lnC₁

56.

Which of the following reaction is not possible ?

(a)	2KBr + Cl₂ → 2KCl + Br₂
(b)	2Kl + Br₂ → 2KBr + l₂
(c)	2KBr + l₂ → 2Kl + Br₂
(d)	2H₂O+ 2F₂ → 4HF + O₂

57.

emf of the cell

Zn Ι ZnSO_{4(0.01 M)} ΙΙ CuSO_{4(1.0 M)} Ι Cu is E₁.When concentration of ZnSO₄ is 1.0 M, and that of CuSO₄ is kept 0.01 M. The emf is E₂. What is the relation between E₁ and E₂ ?

(a)	E₁ > E₂
(b)	E₁ < E₂
(c)	E₁ = E₂
(d)	E₂ = 0 ≠ E₁

58.

Which of the following option is correct for the calculation of Λ ° {CH}_{3} COONa with the help of Λ ° {CH}_{3} COONa and Λ ° HCl ?

(a)	$λ ° {Cl}^{-}$
(b)	$Λ ° NaCl$
(c)	$λ ° H^{+}$
(d)	$Λ ° {ClCH}_{2} COOH$

59.

Calculate E_cell for the following cell.

AgΙ Ag⁺_{(0.01 M)} ΙΙ Ag⁺_{(0.1 M)} Ι Ag ;
E°_Ag⁺ΙAg = 0.80 V

(a)	E^°_cell = 0.80 V
(b)	E^°_cell = 0.0296 V
(c)	Cell will not work as both electrodes are same
(d)	E^°_cell = 0.059 V

60.

What is cell potential of the following cell.

E^°_{(Cr³⁺ΙCr)} = -0.72V and

E^°_{(Fe²⁺ΙFe)} = -0.42V

Cr Ι Cr³⁺_{(0.1 M)} ΙΙ Fe²⁺_{(0.01 M)} Ι Fe

(a)	-0.26V
(b)	0.26V
(c)	0.339V
(d)	-0.339V

Showing 51 to 60 out of 158 Questions