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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.

Related tags

ScienceClass10ElectrolysisChemical ReactionsGas RatioChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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