Predict the products of electrolysis in each of the following:
$(i)$ An aqueous solution of $AgNO_3$ with silver electrodes.
$(ii)$ An aqueous solution of $AgNO_3$ with platinum electrodes.
$(iii)$ $A$ dilute solution of $H_2SO_4$ with platinum electrodes.
$(iv)$ An aqueous solution of $CuCl_2$ with platinum electrodes.

(N/A) $(i)$ At cathode: $Ag_{(aq)}^{+} + e^{-} \longrightarrow Ag_{(s)}$ (Silver deposits).
At anode: $Ag_{(s)} \longrightarrow Ag_{(aq)}^{+} + e^{-}$ (Silver dissolves).
$(ii)$ At cathode: $Ag_{(aq)}^{+} + e^{-} \longrightarrow Ag_{(s)}$ (Silver deposits).
At anode: $2H_2O_{(l)} \longrightarrow O_{2_{(g)}} + 4H_{(aq)}^{+} + 4e^{-}$ (Oxygen gas is evolved).
$(iii)$ At cathode: $H_{(aq)}^{+} + e^{-} \longrightarrow \frac{1}{2} H_{2_{(g)}}$ (Hydrogen gas is evolved).
At anode: $2H_2O_{(l)} \longrightarrow O_{2_{(g)}} + 4H_{(aq)}^{+} + 4e^{-}$ (Oxygen gas is evolved).
$(iv)$ At cathode: $Cu_{(aq)}^{2+} + 2e^{-} \longrightarrow Cu_{(s)}$ (Copper deposits).
At anode: $2Cl_{(aq)}^{-} \longrightarrow Cl_{2_{(g)}} + 2e^{-}$ (Chlorine gas is evolved).