JEE Main Chemistry question

Statement 1: Atomic size of silver is almost equal to that of gold. Statement 2: d-subshell has low penetration power and produce poor shielding.

(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

Silver and gold do have almost identical atomic radii (≈144 pm each) due to the lanthanide contraction, which offsets the size increase otherwise expected on descending from period 5 to period 6 — the Assertion is true. The Reason, that d-subshells shield poorly, is a true general fact about -electrons, but the

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Question ID VK-133224