Biomolecules — Chemistry STD 12 — Question

The button cell used in watches functions as follows.

$Zn _{( s )}+ Ag _2 O _{( s )}+ H _2 O _{( l )} \rightleftharpoons 2 Ag _{( s )}+ Zn _{( aq )}^{2+}+2 OH _{( aq )}^{-}$

the half cell potentials are

$Ag _2 O _{( s )}+ H _2 O _{( l )}+2 e ^{-} \longrightarrow 2 Ag _{( s )}+2 OH _{( aq )}^{-}$

$E ^0=0.34 V$ The cell potential will be