Question

In an electrolysis of an aqueous solution of sodium sulphate, 2.4 litre of oxygen at STP was liberated at anode. The volume of hydrogen at STP liberated at cathode would be

(A) 1.2 L 

(B) 2.4 L 

(C) 2.6 L 

(D) 4.8 L

Answer 1

Correct option (D) 4.8 L

Explanation : 

When aqueous solution of Na₂SO₄ is electrolysed, the reactions occuring at the two electrodes are

As it is evident that the moles of H₂ and O₂ liberated at respective electrodes is in the ratio of 2 : 1, so will be the volume ratio at STP.