A button cell used in watches functions as following :
`Zn_((s)) + Ag_(2)O_((s)) + H_2O_((l)) If half cell potential are `Zn_((aq))^(2+) + 2e^(-) to Zn_((s))`
`E^@ = -0.76 V`
`Ag_2O_((s)) + H_2O_((l)) + 2e^(-) to 2Ag_((s)) + 2OH_((aq))^(-) E^(@) = 0.34 V`
The cell potential will be ............... .

Options

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

Answer

A