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Question

The standard electrode potentials for the reactions
Ag+(aq.)+eAg(s)
Sn2+(aq.)+2eSn(s)
at 25oC are 0.80 volt and 0.14 volt respectively. The emf of the cell,
Sn | Sn2+(1M)||Ag+(1M)| Ag is :

A
0.66 volt
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B
0.80 volt
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C
1.08 volt
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D
0.94 volt
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Solution

The correct option is A 0.94 volt
Ag+(aq)+eAg(s)
Sn2+(aq)+2eSn(s)
T=25oC
Sn|Sn2+(1M||Ag2+(1M)|Ag is:
EAg=0.80V
ESn=0.14V
EoCell=EocathodeEoanode
=0.80(0.14)
=0.80+0.14
=0.94V
ECell=EoCell0.529log[products][reactants]
=0.940.5292×0
=0.94

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