When a lead storage battery is discharged,

Give the uses of the mercury cell.

Mark the false statement.

The resistance of a cell does not depend on

Give the chemical reaction when a $Cu$ rod is kept in an $AgNO_{3}$ solution.

Based on the reaction $\frac{4}{3} \, Al + O_2 \to \frac{2}{3} \, Al_2O_3$,with $\Delta G = -827 \, kJ \, mol^{-1}$ of $Al_2O_3$,what is the minimum $e.m.f.$ required for the electrolysis? $(F = 96500 \, C \, mol^{-1})$