CBSE 2026 · Region 3 · Set 2 · Q12 · 1 mark
For the reaction 2A → 3B, the rate of reaction $\displaystyle +\frac{\mathrm{d}[\mathrm{B}]}{\mathrm{dt}}$ is equal to :
Official answer
From CBSE’s own marking scheme for this paper.
(A)
$\displaystyle -\frac{3}{2} \frac{\mathrm{~d}[\mathrm{~A}]}{\mathrm{dt}}$
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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.