A button cell used in watches function as following {\Zn}( {\s})+ {\Ag}_2 {\O}( {\s})+ {\H}_2 {\O}(ℓ) ⇌ 2 {\Ag}( {\s})+ {\Zn}^{2+}( {\aq})+2 {\OH}^{-}( {\aq}) If half cell potentials are {\Zn}^{2+}( {\aq})+2 e^{-} \to {\Zn}( {\s}) ; {\E}^{\circ}=-0.76 {\V} {\Ag}_2 {\O}( {\s})+ {\H}_2 {\O}(ℓ)+2 e^{-} \to 2 {\Ag}( {\s})+2 {\OH}^{-}( {\aq}) {\E}^{\circ}=0.34 {\V} The cell potential will be :-

AIPMT 2013 Physics and Chemistry Paper

Question : 81 of 90

Marks: +1, -0

A button cell used in watches function as following
Zn(s)+Ag2O(s)+H2O(ℓ)⇌2‌Ag(s)+
Zn2+(aq)+2OH−(aq)
If half cell potentials are
Zn2+(aq)+2e−→Zn(s);E∘=−0.76V

Ag2O(s)+H2O(ℓ)+2e−→2‌Ag(s)+2OH−(aq)

E∘=0.34V
The cell potential will be :-

1.34V
1.10V
0.42V
0.84V

Validate

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