Question

Electrolysis of water is a decomposition reaction. The mole ratio of hydrgen and oxygen gases

liberated during electrolysis of water is :

(a) 1 : 1

(b) 2 : 1

(c) 4 : 1

(d) 1 : 2​

Answer 1

Answer: 2 : 1

Explanation:

• The balanced equation is 2H 2 + O 2 –> 2 H 2 O.
• It takes two hydrogen atoms for every oxygen atom to produce this reaction, so the mole ratio between hydrogen and oxygen is 2:1.

MORE TO KNOW

• The reaction produces two water molecules, so the mole ratio between oxygen and water is 1:2, but the mole ratio between water and hydrogen is 2:2.