Question

A solution of sodium sulphate in water is electrolysed using inert electrodes. The products at cathode and anode are respectively. 

(a) H₂,O₂ 

(b) O₂,H₂ 

(c) O_2,Na 

(d) O₂,SO₂

Answer 1

The correct option: (a) H₂,O

Explanation:

Na⁺ ions are not reduced at cathode and SO^2-_{4 ^-} ions are not oxidized at anode

Cathode: 2H₂(l) → O₂ (g) + 4H⁺ (aq) + 4e^– 

Anode: 2H₂O(l) + 2e^– → H₂(g) + 2OH^– (aq)