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Question

The standard e.m.f. of a galvanic cell involving cell reaction with n=2 is found to be 0.295 V at 250C. The equilibrium constant of the reaction would be?

A
1.0×1015
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B
2.0×1011
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C
4.0×1012
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D
1.0×1010
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Solution

The correct option is D 1.0×1010

given

n=2

E0=0.295V

T=25+273=278

At equilibrium Gibbs energy is zero.

ΔG=0

so, electrode potential also zero.

ΔG=E=0

Using Nernst equation

E=E0RTzFInQ or

E=E00.0592VnlogKeq [ when temperature is 298K ]

E0=0.059nlogKeq

0.295=0.0592logKeq

Keq=1010

Hence, option(d) is the correct answer.


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