Home Chemistry Co-ordinatios Compounds General The complex [Fe(H2O)5NO]2+ is formed in the …
Chemistry Co-ordinatios Compounds General Single Correct MCQ
Published on: August 13, 2026

The complex [Fe(H2O)5NO]2+ is formed in the brown ring test for nitrates when freshly prepared FeSO4 solution is added to aqueous solution of NO3– ions followed by addition of conc. H2SO4. Select correct statement about this complex.

A
Hybridisation of iron is sp3d2.
B
Iron has +1 oxidation state.
C
It has magnetic moment of 3.87 B . M. confirming three unpaired electrons in Fe.
D
All the above are correct statements.

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Verified by Experts
The correct answer is:
D

[Fe(I) (H2O)5 NO+]

Three unpaired electrons

six – sp3d2 hybrid orbital

So μ = 3.87.

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