Chemistry XII - ElectroChemistry 06

Question : 1

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In order to get higher value of  E_cell , the correct statement is

Options:

	Concentration of cathode solution >> Concentration of anode solution
	Concentration of anode solution >> Concentration of cathode solution
	Concentration of anode solution = Concentration of cathode solution
	Ecell does not depend on concentration

Solution :

(1)

E_cell = (ERP)_cathode – (ERP)_anode
ERP ∝ [Mn⁺]

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Question : 2

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Zn(s) + Cu⁺²(C₁) → Zn⁺²(C₂) + Cu(s); E_cell = x volt
2Zn(s) + 2Cu⁺²(C₁) → 2Zn⁺²(C₂) + 2Cu(s); E_cell = y volt
then the correct relation is

Options:

	x = y2
	y = x2
	x = 2y
	x = y

Solution :

(4)

E_cell is characteristic of the given redox
reaction and does not change with
multiplication factor.

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Question : 3

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The electrode potential of hydrogen electrode at pOH = 10 is

Options:

	+0.236 V
	–0.236 V
	+0.118 V
	–0.118 V

Solution :

(2)

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Question : 4

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At equilibrium Nernst’s equation becomes

Options:

Solution :

(1)

At equilibrium,

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Question : 5

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Which of the following statement is incorrect?

Options:

	Metals which have low S.R.P. value are strong reducing agent
	Metals which have S.R.P. > 0 will be weakly electronegative
	Metals which have low S.R.P. value, their oxides are thermally stable
	Lithium has lowest value of S.R.P.

Solution :

(2)

The correct statements are facts.

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Question : 6

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E_cell depends on

Options:

	Volume of electrolyte solution taken
	Size of electrode taken
	Concentration of electrolyte solution taken
	All of these

Solution :

(3)

Fact.

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Question : 7

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Which of the following electrode represents metalmetal insoluble salt-anion electrode?

Options:

	Zn(s)|Zn+2(aq)
	Pt|Fe+2(aq), Fe+3(aq)
	Pt, H2(g)|H+(aq)
	Ag|AgCl|Cl–(aq)

Solution :

(4)

The half cell representation suggests this.

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Question : 8

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If a graph is plotted between E_OX versus log[M⁺ⁿ], then the intercept and slope respectively are

Options:

Solution :

(1)

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Question : 9

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The magnitude of potential of an electrode depends on

Options:

	Nature of electrode
	Concentration of ions
	Temperature
	All of these

Solution :

(4)

Fact.

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Question : 10

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 If E°_A⁺³/A  is y₂ and 2  E°_A/A⁺² is y₁, then E°_{A⁺³/A⁺²} will be

Options:

	(y2 + y1)
	y2 – y1
	y1 – y2
	3y2 + 2y1

Solution :

(4)