CBSE 2023 · Region 5 · Set 2 · Q6 · 1 mark
Which of the following ions has the electronic configuration $\displaystyle 3 \mathrm{~d}^{6}$? (Atomic number: $\displaystyle \mathrm{Mn}=25, \mathrm{Co}=27, \mathrm{Ni}=28$ )
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle \mathrm{Co}^{3+}$
The d-and f-Block ElementsElectronic Configurations of the d-Block ElementsRemembermcqeasy
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CBSE Class 12 Chemistry past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.