Question

The volume ratio of hydrogen and oxygen gases liberated during electrolysis of water is:

• A. 1 : 2
• B. 2 : 1
• C. 1 : 3
• D. 4 : 1

Hint:

Electrolysis of water → H$_2$ : O$_2$ = 2 : 1.

Answer 1

The Correct Option is B

Concept: Electrolysis of water decomposes it into hydrogen and oxygen gases. The ratio of gases produced is based on the chemical equation. Balanced Equation: \[ 2H_2O(l) \rightarrow 2H_2(g) + O_2(g) \] Explanation:

• 2 molecules of hydrogen gas are produced for every 1 molecule of oxygen gas.
• Hence, the volume ratio of hydrogen to oxygen is 2 : 1.

Conclusion: During electrolysis of water, hydrogen and oxygen gases are produced in the ratio 2 : 1 by volume.