When $CuSO_4$ is electrolyzed using platinum electrodes,what happens?

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 following substances conducts electricity?

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

Which one is not a conductor of electricity?

Carnallite on electrolysis gives :