Aqueous solution of nickel sulphate on treating with pyridi…

Chemistry Co-ordinatios Compounds General Single Correct MCQ

Published on: August 13, 2026

Aqueous solution of nickel sulphate on treating with pyridine and then adding a solution of sodium nitrite gives dark blue crystals of :

[Ni(py) 4 ]SO 4

[Ni(py) 2 (NO 2 ) 2 ]

[Ni(py) 4 ](NO 2 ) 2

[Ni(py) 3 (NO 2 )] 2 SO 4

Text Solution

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The correct answer is:

[Ni (H 2 O) 4 ] SO 4 + Pyridine + NaNO 2 [Ni(Py) 4 ](NO 2 ) 2

Stronger ligand, pyridine displaces weaker ligand, H 2 O in aqueous solution.

[Ni(py) 4 ](NO 2 ) 2 is formed as dark blue crystals on crystallisation.

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