Which of the following elements is obtained industrially by the electrolysis of an aqueous solution of its compound?

In the electrolysis of molten $NaCl$,what happens at the anode?

What is the electrolysis of molten $NaCl$?

Electricity required for liberating $710 \ g$ of $Cl_{2(g)}$ by electrolyzing a concentrated solution of $NaCl$ will be

$O_2$ gas will be evolved as a product of electrolysis of $:$
$(A)$ an aqueous solution of $AgNO_3$ using silver electrodes.
$(B)$ an aqueous solution of $AgNO_3$ using platinum electrodes.
$(C)$ a dilute solution of $H_2 SO_4$ using platinum electrodes.
$(D)$ a high concentration solution of $H_2 SO_4$ using platinum electrodes.
Choose the correct answer from the options given below $:$

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