The standard emf for the cell cell reaction ` Zn + Cu^(2+) rarr Zn^(2+) + Cu ` is 1.10 volt at ` 25^@ C`. The emf for the cell reaction when ` 0.1 M Cu^(2+)` and ` 0.1 M ZN^(2+)` solutions are used at `25^@ =C` is .

Options

A. 1.10 V
B. 0.110 V
C. `-1.10 V `
D. `-0.110`V

Answer

A

Explanation

`E_("cell") = E_("cell")^(@) + (0.0592)/(2) log _(10) ([Cu^(2+)])/([Zn^(2+)])`
As `[Cu^(2+)] = [Zn^(2+)] therefore E_(cell) = E_(cell)^(@) = 1.1 V `