CBSE 2026 · Region 3 · Set 2 · Q5 · 1 mark
The oxidation number of Co in $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5}(\mathrm{ONO})\right] \mathrm{SO}_{4}$ is :
Official answer
From CBSE’s own marking scheme for this paper.
(A)
$\displaystyle + 3$
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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.