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Chemistry · 2026 · 1 mark
CBSE 2026 · Region 2 · Set 1 · Q13
Assertion (A): The molecularity of the given reaction is 2 2 HI → H_2+ I_2 Reason (R): Two molecules of the reactants are involved in simultaneous…
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
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
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CBSE Class 12 Chemistry past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.