CBSE 2026 · Region 1 · Set 2 · Q4 · 1 mark
For a reaction : $\displaystyle \mathrm{N}_{2}+3 \mathrm{H}_{2} \longrightarrow 2 \mathrm{NH}_{3}$, the rate of reaction with respect to $\displaystyle \mathrm{NH}_{3}$ is
Official answer
From CBSE’s own marking scheme for this paper.
(D)
$\displaystyle +\frac{1}{2} \frac{\Delta\left[\mathrm{NH}_{3}\right]}{\Delta \mathrm{t}}$
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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.