CBSE 2026 · Region 4 · Set 1 · Q10 · 1 mark
The rate of a first order reaction is $\displaystyle 5 \cdot 6 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$, when the concentration of reactant is $\displaystyle 0.2 \mathrm{~mol} \mathrm{~L}^{-1}$. The rate constant ' k ' is :
Official answer
From CBSE’s own marking scheme for this paper.
(D)
$\displaystyle 2.8 \times 10^{-3} \mathrm{~s}^{-1}$
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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.