Which of the following elements is extracted industrially by the electrolysis of its aqueous solution?

Molten $CuCl_2$ is electrolysed using platinum electrodes. The reaction occurring at the anode is:

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.

Which of the substances $Na$,$Hg$,$S$,$Pt$ and graphite can be used as electrodes in electrolytic cells having aqueous solutions?

Which of the following will give $H_{2(g)}$ at cathode and $O_{2(g)}$ at anode on electrolysis using platinum electrodes?

Which of the following elements is extracted commercially by the electrolysis of an aqueous solution of its compound?