In the process of electrolysis,the current is carried out inside the electrolyte by

Assertion : $A$ small amount of acid or alkali is added before electrolysis of water.
Reason : Pure water is a weak electrolyte.

Which of the following pairs has easier reduction at the cathode?

Which among the following is common for electrolysis of molten $NaCl$ and aqueous $NaCl$?

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.

What happens to the $pH$ during the electrolysis of aqueous $CuSO_4$ using platinum electrodes?