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Which gas is obtained in a greater volume during the electrolysis of water?

Answer and explanation

Correct answer: Hydrogen

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 volume is proportional to the number of moles, so the volume ratio of hydrogen to oxygen is \(2:1\). Therefore, hydrogen is obtained in the greater volume, while oxygen is produced in half that volume.

Related tags

ScienceClass 10Chemical ReactionsElectrolysis Of WaterHydrogenBalanced Equation

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