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  4. Of the following complex ions which is diamagnetic in nature?

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Q. Of the following complex ions which is diamagnetic in nature?

AIPMTAIPMT 2011Coordination Compounds

Solution:

$\left[ Ni ( CN )_{4}\right]^{2+}$ has $d ^{8}( Ni , 2+)$ which undergoes pairing to give (refer to image) dsp ${ }^{2}$ hybridisation and no unpaired electron so diamagnetic.