JEE Main Chemistry question

Statement 1: Magnetic moments values of actinides are lesser than the theoretically predicted values. Statement 2: Actinide elements are strongly paramagnetic.

(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

Observed magnetic moments of actinide ions are indeed lower than the spin-only theoretical values, because the electrons of actinides are less effectively shielded, leading to quenching of the orbital angular momentum contribution — so Statement 1 is true. Many actinide compounds

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Question ID VK-147375