CBSE 2026 · Region 2 · Set 1 · Q14 · 1 mark
Assertion (A) : Zinc, cadmium and mercury are not considered as transition elements.
Reason (R) : These elements have completely filled orbitals in their ground state as well as in their common oxidation states.
Official answer
From CBSE’s own marking scheme for this paper.
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
The d-and f-Block ElementsElectronic Configurations of the d-Block ElementsAnalyseassertion_reasonmedium
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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.