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Question

Consider the following half cells
Cu(s)Cu2+(aq)+2e ; Eo=0.325 V
Cu+(aq)+eCu(s) ; Eo=0.50 V
The Eo for the reaction 2Cu+(aq)Cu2+(aq)+Cu(s) is

A
0.175 V
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B
0.35 V
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C
0.675 V
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D
0.3375 V
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Solution

The correct option is A 0.175 V
(1) Cu(s)Cu2+(aq)+2e ; E1=0.325 V
(2) Cu+(aq)+eCu(s) ; E2=0.50 V

The required reaction is: 2Cu+(aq)Cu2+(aq)+Cu(s)

We need to combine the two above mentioned reactions so as to form the final reaction and the resultant standard EMF will be a summation of the Eoof the combining reactions.

E3=0.325+0.5=0.175V

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