CBSE 2026 · Region 1 · Set 1 · Q7 · 1 mark
The secondary valency of Co in the complex $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5}\left(\mathrm{NO}_{2}\right)\right]^{2+}$ is
Official answer
From CBSE’s own marking scheme for this paper.
(D)
$\displaystyle 6$
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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.