MCQs of Electrochemistry

Electrochemistry MCQs

MCQs of Electrochemistry

Showing 61 to 70 out of 158 Questions

61.

Choose the strongest oxidising agent from the following.

[Fe(CN)₆]^4- → [Fe(CN)₆]^3- + e^- ,

E^° = -0.35V

Fe²⁺ → Fe³⁺ + e^-, E^° = -0.77 V

(a)	Fe²⁺
(b)	Fe³⁺
(c)	[Fe(CN)₆]^3-
(d)	[Fe(CN)₆]^4-

62.

For how much time; 10 mili ampear, current should be passed through NaCl to get 0.01 mole H₂ gas at cathode ? [1 F = 96500 C]

(a)	9.65 × 10⁴ S
(b)	19.3 × 10⁴ S
(c)	28.95 × 10⁴ S
(d)	38.6 × 10⁴ S

63.

What is the potential of standard electrode based on following data ?

E^°_{(Fe³⁺ΙFe)} = -0.36V

E^°_{(Fe²⁺ΙFe)} = -0.439V

Fe³⁺ + e^- → Fe²⁺

(a)	-0.072V
(b)	0.385V
(c)	0.770V
(d)	-0.270V

64.

What is the value of E_cell of the following cell reactions ?

Cell Process: 2Fe_(s) + O_2(g) + 4H⁺_(aq) → 2Fe²⁺_(aq) + 2H₂O_(R), pH = 3 E^° = 1.67V Where [Fe²⁺] = 10^-3M, P(O₂) = 0.1 atm.

(a)	1.47 V
(b)	1.77 V
(c)	1.87 V
(d)	1.57 V

65.

Which of the following reactions takes place in Danial cell ?

(a)	${Cu}_{(s)} + {Zn}^{2 +}_{(aq)} ⇋ {Cu}^{2 +}_{(aq)} + {Zn}_{(s)}$
(b)	${Mg}_{(s)} + {Zn}^{2 +}_{(aq)} ⇋ {Mg}^{2 +}_{(aq)} + {Zn}_{(s)}$
(c)	${Zn}_{(s)} + {Cu}^{2 +}_{(aq)} ⇋ {Zn}^{2 +}_{(aq)} + {Cu}_{(s)}$
(d)	${Zn}_{(s)} + {Mg}^{2 +}_{(aq)} ⇋ {Zn}^{2 +}_{(aq)} + {Mg}_{(s)}$

66.

In the reaction Mⁿ⁺_(aq) + ne^- →M_(s), The standard reduction potential of M₁, M₂ and M₃ are -0.34 V, -3.05 V and -1.66 V respectively then their order of strength as reducing agent will be _____

(a)	M₁ > M₂ > M₃
(b)	M₃ > M₁ > M₂
(c)	M₁ > M₃ > M₂
(d)	M₂ > M₃ > M₁

67.

Which relation is corrected for Faraday's second law of electrolysis ? m₁ and m₂ = Quantity of product E₁ and E₂ = Equivalent weights of product

(a)	m₂E₂ > m₂E₁
(b)	m₁E₂ < m₂E₁
(c)	m₁E₂ = m₂E₁
(d)	m₁E₂ = m₂E₂

68.

Which of the following is the correct formula for specific conductance ?

(a)	$K = ρ \frac{l}{A}$
(b)	$K = G \frac{l}{A}$
(c)	$K = G \frac{A}{l}$
(d)	$K = ρ \frac{A}{l}$

69.

To which electrolyte Kolhrausch's law is not applicable ?

(a)	KCl
(b)	HCl
(c)	KBr
(d)	NaCl

70.

What is the concentration of H₂SO₄ used in lead storage cell ?

(a)	25 % W/W
(b)	2.5 % W/V
(c)	38 % W/W
(d)	30 % W/V

Showing 61 to 70 out of 158 Questions