Question

Which of the following statements are correct?

a) The electrolysis of aqueous NaCl produces hydrogen gas at the cathode and chlorine gas at the anode .

b) The electrolysis of a $CuS{O}_4$ solution using Pt electrodes causes the liberation of $O_2$ at the anode and the deposition of copper at the cathode .

c) Oxygen and hydrogen are produced at the anode and cathode during the electrolysis of dilute aqueous solution of $H_{2}S{O}_4$ .

d) All electrolytic reactions are redox reactions .

• A. Only A is correct
• B. A,B are correct
• C. A,D are correct
• D. A,B,C and D are correct

Answer 1

The correct option is D A,B,C and D are correct

During electrolysis of aqueous NaCl solution, at the cathode, hydrogen is obtained from water, and at anode, chlorine is obtained from NaCl.

During electrolysis of copper sulphate solution with platinum electrodes, at anode, oxygen is evolved from water, and at cathode, copper is deposited.

During electrolysis of dilute aqueous sulfuric acid solution, water dissociates to form hydrogen and oxygen. Hydrogen is evolved at cathode and oxygen is evolved at anode.

During electrolysis, one species is reduced and other species is oxidized. Thus all electrolytic reactions are redox reactions.

Hence, option D is correct.