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Question

Given:
Cu2++eCu+;E=0.15 volt
Cu++eCu;E=0.5 volt
Calculate potential for Cu2++2eCu.

A
0.251 volt
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B
0.325 volt
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C
0.625 volt
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D
0.125 volt
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Solution

The correct option is B 0.325 volt
Cu2++eCu+;E=0.15V;G=(1)×(96500)×(0.15)=14475\\ Cu++eCu;E=0.5V;G=48250$
Adding above two reactions;
Cu2++2eCu;G=62725
Ecell=GnF=627252×96500=0.325V

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