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Why is the volume of hydrogen gas greater than the volume of oxygen gas during electrolysis of water?

Answer and explanation

Correct answer: Each water molecule contains two hydrogen atoms and one oxygen atom.

The formula of water is \(\mathrm{H_2O}\), so each water molecule contains two hydrogen atoms and one oxygen atom. The balanced electrolysis equation is \(2\mathrm{H_2O} \rightarrow 2\mathrm{H_2} + \mathrm{O_2}\). Therefore, under the same conditions, the volume of hydrogen produced is twice the volume of oxygen. Option A is incorrect because water does not contain equal numbers of hydrogen and oxygen atoms.

Related tags

ScienceClass 10Chemical ReactionsElectrolysis Of WaterStoichiometryChemical Equations

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