Write down Nernst equation. How it is useful in calculating the potential of a cell?

$1 \mathrm{N}$ solution of a salt surrounding two platinum electrodes $2.1 \mathrm{cm}$ apart and $6.3 {\mathrm{cm}}^2$ in area was found to offer a resistance of $50 \mathrm{ohm}$. Calculate the equivalent conductance of the solution.

${\mathrm{Ag}}^{+} + {\mathrm{e}}^{-} \to \mathrm{Ag} ; {\mathrm{E}}_{\mathrm{cell}}° = +0.8 \mathrm{V}$ and ${\mathrm{Zn}}^{2+} + 2{\mathrm{e}}^{-} \to \mathrm{Zn} ; {\mathrm{E}}_{\mathrm{cell}}° = -0.76 \mathrm{V}$. Calculate the cell potential for the reaction, $2\mathrm{Ag}\left(\mathrm{s}\right) + {\mathrm{Zn}}^{2+}\left(\mathrm{aq}\right) \to 2{\mathrm{Ag}}^{+}\left(\mathrm{aq}\right) + \mathrm{Zn}\left(\mathrm{aq}\right)$.

Write down the working of mercury dry cell?

Write down the working of nickel cadmium cell.