$Zn_{(s)} | Zn^{2+}_{(aq)} || Cu^{2+}_{(aq)} | Cu_{(s)}$ is

If the salt bridge between two half-cells is removed,the voltage of the cell:

The following four solutions are kept in separate beakers and copper metal is put in each of them. Which solution will become blue after some time?

Saturated solution of $KNO_3$ is used to make salt bridge because

Give the uses of the lead storage cell.

The minimum voltage (in $V$) required to bring about the electrolysis of $1 \ M$ copper$(II)$ sulphate solution at $298 \ K$ is (Given $E^{\circ}_{Cu^{2+}/Cu} = 0.34 \ V$ and $E^{\circ}_{O_2/H_2O} = 1.23 \ V$)