Question

Electrolysis of acidified water produces a gas P at cathode and gas Q at anode. Identify the gases P and Q, and determine the ratio in which these gases are released at cathode and anode, respectively?

• A. P: Hydrogen; Q: Oxygen; Ratio: 1:2
• B. P: Oxygen; Q: Hydrogen; Ratio: 1:2
• C. P: Oxygen; Q: Hydrogen; Ratio: 2:1
• D. P: Hydrogen; Q: Oxygen; Ratio: 2:1

Answer 1

The correct option is D P: Hydrogen; Q: Oxygen; Ratio: 2:1

On electrolysis of water, hydrogen and oxygen gas are produced at cathode and anode respectively.
$\text{2H}$${}_2$$\text{O(l)}$ $\to$ $\text{2H}$${}_2$$\text{(g)}$ $+$ $\text{O}$${}_2$$\text{(g)}$
The ratio in which they are released at cathode and anode is 2:1.