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

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

Two statements are given below.
Statement $I$ : Molten $NaCl$ is electrolysed using $Pt$ electrodes. $Cl_2$ is liberated at anode.
Statement $II$ : Aqueous $CuSO_4$ is electrolysed using $Pt$ electrodes. $O_2$ is liberated at cathode.
The correct answer is

Which of the following reactions occurs at the anode when the electrolysis of an aqueous $CuSO_4$ solution is carried out using copper electrodes?

Which of the following conducts electricity?

Which of the following substances conducts electricity?