The standard electrode potentials for the reactions,
`Ag^(+) (a.q) + e^(-) rarr Ag (s)`
`Sn^(2+) (a.q) + 2e^(-) rarr Sn (s)` at `25^(@)C` are 0.80 volt and `-0.14` volt respectively. The emf of the cell
`Sn|Sn^(2+) (1M)|| Ag^(+) (1M) | Ag` is:
A. 0.66 volt
B. 0.80 volt
C. 1.08 volt
D. 0.94 volt