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Science · 2026 · 1 mark
CBSE 2026 · Region 2 · Set 1 · Q20
When Mg metal is treated with hot water, it starts floating on the surface of the water. The reason for its different behaviour is :
Official answer
From CBSE’s own marking scheme for this paper.
(B)
Mg reacts with water to produce $\displaystyle \mathrm{H}_{2}$ gas which helps in floating.
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CBSE Class 10 Science past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.