CBSE 2026 · Region 2 · Set 1 · Q13 · 1 mark
Assertion (A) : The molecularity of the given reaction is $\displaystyle 2$ \[2 \mathrm{HI} \longrightarrow \mathrm{H}_{2}+\mathrm{I}_{2} \]
Reason (R) : Two molecules of the reactants are involved in simultaneous collision between them.
Official answer
From CBSE’s own marking scheme for this paper.
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
Chemical KineticsFactors Influencing Rate of a ReactionUnderstandassertion_reasoneasy
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CBSE Class 12 Chemistry past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.