In the brown-ring test for nitrates, the solution is mixed with freshly prepared FeSO₄ solution and conc. H₂SO₄ is poured carefully down the side of the test tube; a brown ring of complex (p) appears

Question

In the brown-ring test for nitrates, the solution is mixed with freshly prepared FeSO₄ solution and conc. H₂SO₄ is poured carefully down the side of the test tube; a brown ring of complex (p) appears at the junction of the two layers, the gas (r) being generated in situ by reduction of the nitrate. Which of the following is WRONG about the complex (p)?

TestHub · Accepted Answer

[Fe(H₂O)₆]²⁺ is pale green; the brown colour belongs to [Fe(H₂O)₅NO]²⁺. The complex is octahedral, Fe(+1, 3d⁷) with NO⁺ gives 3 unpaired electrons, and NO⁺ is isoelectronic with CO (B.O. = 3).

Chemistry - Complete P-block Question with Solution | TestHub

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