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In electrolysis of water, if hydrogen is thirty-six millilitres, what will be the expected volume of oxygen?

Answer and explanation

Correct answer: Eighteen millilitres

The balanced decomposition equation is 2H₂O → 2H₂ + O₂. Under the same conditions of temperature and pressure, gas volumes follow the coefficient ratio, so hydrogen : oxygen = 2 : 1. If hydrogen occupies 36 mL, oxygen occupies 36 ÷ 2 = 18 mL. Thus option A is correct; 36 mL ignores the ratio, 72 mL reverses it, and 12 mL uses an incorrect factor.

Related tags

ScienceClass10ElectrolysisStoichiometryChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourClass 10 Mcq

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