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: $Ag^+_{(aq)} + e^- \rightarrow Ag_{(s)}$. At anode: $Ag_{(s)} \rightarrow Ag^+_{(aq)} + e^-$.
$(ii)$ At cathode: $Ag^+_{(aq)} + e^- \rightarrow Ag_{(s)}$. At anode: $2H_2O_{(l)} \rightarrow O_{2(g)} + 4H^+_{(aq)} + 4e^-$.
$(iii)$ At cathode: $2H^+_{(aq)} + 2e^- \rightarrow H_{2(g)}$. At anode: $2H_2O_{(l)} \rightarrow O_{2(g)} + 4H^+_{(aq)} + 4e^-$.
$(iv)$ At cathode: $Cu^{2+}_{(aq)} + 2e^- \rightarrow Cu_{(s)}$. At anode: $2Cl^-_{(aq)} \rightarrow Cl_{2(g)} + 2e^-$.