A button cell used in watches functions as following Zn(s)+Ag_2O(s)+H_2O(l) 2 Ag(s)+Zn^2+(aq)+2 O...

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A button cell used in watches functions as following
Zn(s)+Ag_2O(s)+H_2O(l) 2 Ag(s)+Zn^2+(aq)+2 OH^-(aq)⇌
If half cell potentials are :
Zn^2+(aq)+2 e^-→Zn(s) ; E^o=-0.76  V
Ag_2O(s)+H_2O(l)+2 e^-→ 2 Ag(s)+2 OH^-(aq) ; E^o=0.34  V
The cell potential will be :
(a) 0.42  V
(b) 0.84  V
(c) 1.34  V
(d) 1.10  V

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