The button cell used is watches function as follows
`Zn(s) +Ag_(2) O (s) + H_(2) O (l) rarr 2 Ag (s) + Zn^(2+) (aq) + 2OH^(-) (aq) ` the half cell potentials
are `Ag_(2) O (s) + H_(2)O (l) +2e^(-) rarr 2Ag (s) + 2OH^(-) (aq) E = 0.34 V ` The cell potential will be

Options

A. `0.84` V
B. `1.34` V
C. `1.10`V
D. `0.42 ` V

Answer

C

Explanation

Anodic oxidation: (Reverse the given reaction)
`(E_(ox)^(@) ) = 0.76 V ` cathodic reduction
`:. E_("cell")^(@) = (E_(ox)^(@)) +(E_("red")^(@))`
`= 0.76 +0.34 =1.1 V `