Question

Question 11

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

(a) 1:1
(b) 2:1
(c) 4:1
(d) 1:2

Answer 1

Option (b) is correct.

Water undergoes decomposition during electrolysis and forms hydrogen and oxygen gas in the ratio 2:1 by volume. The reaction occurs as follows:

$2{\text{H}}_2\text{O}\to 2{\text{H}}_2+{\text{O}}_2$