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Chemistry · 2023 · 1 mark
The d-and f-Block ElementsGeneral Properties of the Transition Elements (d-Block)1 markAnalyseassertion reason
CBSE 2023 · Region 4 · Set 1 · Q17
Assertion (A): Zr and Hf have almost identical radii. Reason (R): Both Zr and Hf exhibit similar properties.
Assertion (A) : Zr and Hf have almost identical radii. Reason $\displaystyle (R)$ : Both Zr and Hf exhibit similar properties.
Official answer
(B)
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
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CBSE Class 12 Chemistry past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.