CBSE 2025 · Region 1 · Set 1 · Q1 · 1 mark
Electrolysis of water is a decomposition reaction. The mass ratio $\displaystyle \left(\mathrm{M}_{\mathrm{H}}: \mathrm{M}_{\mathrm{O}}\right)$ of hydrogen and oxygen gases liberated at the electrodes during electrolysis of water is :
Official answer
From CBSE’s own marking scheme for this paper.
(D)
$\displaystyle 1$ : $\displaystyle 8$
Chemical Reactions and EquationsCombination and Decomposition ReactionsApplymcqmedium
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CBSE Class 10 Science past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.