CBSE 2026 · Region 5 · Set 1 · Q7 · 1 mark
Half-life $\displaystyle \left(\mathrm{t}_{1 / 2}\right)$ of a first order reaction is $\displaystyle 1386$ s. The value of rate constant is :
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle 5.0 \times 10^{-4} \mathrm{~s}^{-1}$
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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.