CBSE 2025 · Region 2 · Set 1 · Q13 · 1 mark
Assertion (A) : In a first order reaction, if the concentration of the reactant is doubled, its half-life is also doubled.
Reason (R) : The half-life of a reaction does not depend upon the initial concentration of the reactant in a first order reaction.
Official answer
From CBSE’s own marking scheme for this paper.
(D)
Assertion (A) is false, but Reason (R) is true.
Chemical KineticsIntegrated Rate EquationsAnalyseassertion_reasonmedium
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CBSE Class 12 Chemistry past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.