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Science · 2026 · 1 mark
CBSE 2026 · Region 3 · Set 1 · Q21
The reaction of calcium with cold water is :
Official answer
From CBSE’s own marking scheme for this paper.
(C)
Exothermic, but the heat evolved is not sufficient for the hydrogen to catch fire.
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.