Chemistry XII - ElectroChemistry 07

Question : 1

In concentration cell

Options:

	Ecell = 0
	E°cell = 0
	ΔG° = 0
	All of these

Solution :

(2)

In concentration cell both the half cell are
identical.

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Question : 2

(skipped)

In the given concentration cell,
Pt(s)|H₂(P₂ atm)|H⁺(C₂)||H⁺(C₁)|H₂(P₁ atm)|Pt(s)
the cell reaction is spontaneous in forward direction if

Options:

	(C2)2P1 < (C1)2P2
	(C2)2P1 > (C2)2P2
	(C2)2P1 = (C1)2P2
	C1 + C2 = P1 + P2

Solution :

(1)

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Question : 3

(skipped)

When equilibrium is attained in electrochemical cell, then

Options:

	Electrode potential of anode > Electrode potential of cathode
	Electrode potential of anode < Electrode potential of cathode
	Electrode potential of anode = Electrode potential of cathode
	Flow of electron is increased

Solution :

(3)

At equilibrium, E_cell = 0

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Question : 4

(skipped)

In concentration cell

Options:

	Anode is that electrode in which concentration of electrolyte solution is high
	Cathode is that electrode in which concentration of electrolyte solution is low
	Cathode is that electrode in which concentration of electrolyte solution is high
	Any electrode can be made anode or cathode because both electrodes are of same material

Solution :

(3)

Reduction potential of M|Mⁿ⁺ is directly
proportional to [Mⁿ⁺]

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Question : 5

(skipped)

ΔG° may be equal to zero when the equilibrium constant (K) is

Options:

	K > 1
	K < 1
	K = 1
	All of these

Solution :

(3)

ΔG = ΔG° + RT ln Q
At equilibrium, ΔG = 0
∴ ΔG° = –RT ln K
= 0 if K = 1

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Question : 6

(skipped)

The emf of the cell
A|A⁺³(10^–3 M)||A⁺³(10^–1 M)|A is

Options:

	0.039 volt
	0.089 volt
	–0.059 volt
	+0.059 volt

Solution :

(1)

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Question : 7

(skipped)

The reduction potential of the electrode is,
Pt|Cl₂(10 atm)|2Cl^–(10^–5 M).

If E° _Cl2/Cl^– = 1.36 V

Options:

	1.68 volt
	–1.68 volt
	1.18 volt
	–1.18 volt

Solution :

(1)

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Question : 8

(skipped)

The correct relation is

Options:

	Welectrical = –ΔG
	At equilibrium ΔG° = 0
	ΔG° = –2.303 nRT lnK
	Welectrical = F × Ecell

Solution :

(1)

Useful work done = ΔG = –nFE_cell

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Question : 9

(skipped)

For a particular electrochemical cell, which one of the following statements is correct?

Options:

	Current flows from cathode to anode
	Ecell is constant having different concentration of ions
	Both E°cell and Ecell are constant having different concentrations of ions
	Neither E°cell nor Ecell is constant having different concentration of ions

Solution :

(1)

Fact

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Question : 10

(skipped)

The maximum work done for the following cell is,
A|A⁺³||B⁺²|B; E°_cell = 0.30 volt

Options:

	280.65 kJ
	305.60 kJ
	109.16 kJ
	173.7 kJ

Solution :

(4)

ΔG° = o
−nFE_cell
= –6 × 96500 × 0.30
= –173.7 kJ