A button cell used in watches functions as follows Zn s + Ag 2 O s + H 2 O ⇌ 2 Ag s + Zn 2 + aq + 2 OH − If half cell potentials are Z n 2 + ( a q ) + 2 e - → Z n ( s ) E ° = - 0.76 V Ag 2 O ( s ) + H 2 O ( l ) + 2 e − → 2 Ag ( s ) + 2 OH −

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A button cell used in watches functions as follows Zn s + Ag 2 O s + H 2 O ⇌ 2 Ag s + Zn 2 + aq + 2 OH − If half cell potentials are Z n 2 + ( a q ) + 2 e - → Z n ( s ) E ° = - 0.76 V Ag 2 O ( s ) + H 2 O ( l ) + 2 e − → 2 Ag ( s ) + 2 OH − E ° = 0.34 V The cell potential will be

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Correct answer: A. 1.1 V

As cell is Z n / Z n 2 + | | A g + / A g E c e l l o = E C a t h o d e o - E A n o d e o = 0.34 - ( - 0.76 ) = 1.1 V

A button cell used in watches functions as follows Zn s + Ag 2 O s + H 2 O ⇌ 2 Ag s + Zn 2 + aq + 2 OH − If half cell potentials are Z n 2 + ( a q ) + 2 e - → Z n ( s ) E ° = - 0.76 V Ag 2 O ( s ) + H 2 O ( l ) + 2 e − → 2 Ag ( s ) + 2 OH − E ° = 0.34 V The cell potential will be

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