The standard EMF for the given cell reaction `Zn + Cu^(2+) rarr Cu + Zn^(2+)` is `1.10 V` 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")^(@)-(0.059)/(2) "log" ([Zn^(+2)])/([Cu^(+2)])`
`= 1.10 - (0.059)/(2)"log"(0.1)/(0.1)`
`= 1.10 V`