What is the ratio of the volumes of hydrogen and oxygen gases collected during the electrolysis of water?
Answer and explanation
Correct answer: 2:1
The balanced equation for electrolysis of water is \(2H_2O(l) \rightarrow 2H_2(g) + O_2(g)\). At the same temperature and pressure, gas volumes are proportional to their moles. Therefore, hydrogen occupies twice the volume of oxygen, so \(H_2:O_2 = 2:1\). The ratio \(1:2\) is the reverse ratio.
Frequently asked questions
What is the correct answer to this question?
2:1
Why is this the correct answer?
The balanced equation for electrolysis of water is \(2H_2O(l) \rightarrow 2H_2(g) + O_2(g)\). At the same temperature and pressure, gas volumes are proportional to their moles. Therefore, hydrogen occupies twice the volume of oxygen, so \(H_2:O_2 = 2:1\). The ratio \(1:2\) is the reverse ratio.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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