CBSE 2025 · Region 6 · Set 3 · Q10 · 1 mark
The primary and secondary valences of Co in $\displaystyle \left[\mathrm{Co}(\mathrm{en})_{3}\right] \mathrm{Cl}_{3}$ respectively are :
Official answer
From CBSE’s own marking scheme for this paper.
(D)
$\displaystyle 3, 6$
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CBSE Class 12 Chemistry past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.