In the electrolysis of water, if the volume of oxygen is five millilitres, what is the expected volume of hydrogen?
Answer and explanation
Correct answer: Ten millilitres
The balanced equation for electrolysis of water is 2H₂O → 2H₂ + O₂. It shows that hydrogen and oxygen are produced in a volume ratio of 2:1 under the same conditions. Therefore, for 5 mL of oxygen, hydrogen volume = 2 × 5 = 10 mL. Thus option B is correct; the other options do not follow the stoichiometric gas ratio.
Frequently asked questions
What is the correct answer to this question?
Ten millilitres
Why is this the correct answer?
The balanced equation for electrolysis of water is 2H₂O → 2H₂ + O₂. It shows that hydrogen and oxygen are produced in a volume ratio of 2:1 under the same conditions. Therefore, for 5 mL of oxygen, hydrogen volume = 2 × 5 = 10 mL. Thus option B is correct; the other options do not follow the stoichiometric gas 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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