NEET 2011 Chemistry question

Of the following complex ions, which is diamagnetic in nature ?

(1)
(2)Correct
(3)
(4)

Answer: (2)

Solution

In , nickel is (). is a strong-field ligand, which pairs the eight electrons in four orbitals and frees one orbital, so hybridisation gives a square planar complex with no unpaired electron, hence diamagnetic.

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Question ID VK-090791