JEE Main Chemistry question

Statement 1: Chromium is hard but mercury is soft. Statement 2: Chromium is a 3d transition element.

(A)Assertion is True, Reason is True; Reason is correct explanation for Assertion
(B)Assertion is True, Reason is True; Reason is not correct explanation for AssertionCorrect
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is True

Answer: (B)

Solution

Chromium is indeed a hard metal while mercury is soft/liquid — Statement 1 is true. Statement 2, that chromium is a 3d transition element, is also a true fact by itself, but it does not explain the hardness contrast: the real reason is that Cr has the maximum number of unpaired -electrons

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Question ID VK-147376