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(C) During the electrolysis of aqueous $KI$ solution,the following reactions occur:At cathode: $2H_2O(l) + 2e^- \rightarrow H_2(g) + 2OH^-(aq)$. Thus,

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$a, c$

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(C) During the electrolysis of aqueous $KI$ solution,the following reactions occur:At cathode: $2H_2O(l) + 2e^- \rightarrow H_2(g) + 2OH^-(aq)$. Thus,$H_2$ gas is released at the cathode.At anode: $2I^-(aq) \rightarrow I_2(s) + 2e^-$. Thus,$I_2$ is formed at the anode,not $O_2$.Since $OH^-$ ions are produced at the cathode,the concentration of $OH^-$ increases,which means the $pH$ of the solution increases and the $pOH$ of the solution decreases.Therefore,statements $(a)$ and $(c)$ are correct.

On electrolysis of aqueous solution of $KI$ in presence of platinum electrodes,which of the following statements are correct?
$(a)$ Hydrogen gas is released at cathode
$(b)$ Oxygen gas is released at anode
$(c)$ $pOH$ of solution decreases
$(d)$ There is deposition of potassium at cathode

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On electrolysis of aqueous solution of $KI$ in presence of platinum electrodes,which of the following statements are correct?$(a)$ Hydrogen gas is released at cathode$(b)$ Oxygen gas is released at anode$(c)$ $pOH$ of solution decreases$(d)$ There is deposition of potassium at cathode