Applications of Electrolysis

Explain gold plating with the help of neat labelled diagram?

The electrolyte commonly used in the electroplating of gold is Sodium argentocyanide:

The electrolytes commonly used in the electroplating of silver and gold are:

List the conditions to kept in mind while doing gold plating.

List the conditions to kept in mind while doing silver plating.

Name the electrolyte taken to perform silver plating.

Faraday's of electricity required to reduce 1 mole of ${\mathrm{MnO}}_4^{-}$ ions to ${\mathrm{Mn}}^{2+}$:

Electrolysis of aqueous solution of $\mathrm{NaCl}$ is carried out in two separate electrolytic cells $\mathrm{A} \& \mathrm{B}$ using same amount of charge.
In cell $\mathrm{A},$ $\mathrm{Pt}$is used as electrodes. In cell $\mathrm{B},$ $\mathrm{Pt}$ is used as anode while $\mathrm{Hg}$is used as cathode.
A greenish yellow gas is evolved with colourless paramagnetic gas in molar ratio $3:1$ at anode in cell
$\mathrm{A},$ while only greenish yellow gas is evolved at anode in cell $\mathrm{B}.$Determine ratio of total volumes of gases evolved in cells $\mathrm{B}$to $\mathrm{A}$during the entire electrolysis.

Name the metal each which is extracted by electrolytic reduction. (Sodium / Zinc / Magnesium)