IIT-JEE 2008 · Paper 2 · Chemistry Q55

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ChemistryAssertion and reason+3 / -1Question 55 of 66

STATEMENT-1: $\ce{[Fe(H2O)5NO]SO4}$ is paramagnetic.

and

STATEMENT-2: The Fe in $\ce{[Fe(H2O)5NO]SO4}$ has three unpaired electrons.

STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1

STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1

STATEMENT-1 is True, STATEMENT-2 is False

STATEMENT-1 is False, STATEMENT-2 is True

Answer and worked solution

Official answer: A

The brown-ring complex. NO binds as $\ce{NO+}$ , so iron is Fe(I), $3d^7$ (with weak-field water ligands, high spin as usually described), having three unpaired electrons (μ ≈ 3.9 B.M.).

Both statements are true, and the unpaired electrons are the reason the complex is paramagnetic.

(A)

Topics:Magnetic properties and colour Anion analysis

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IIT-JEE 2008 · Paper 2, Chemistry question 55