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Question

Which of the following complex ion(s) are paramagnetic ?

A
[Ni(CN)4]2
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B
[NiCl4]2
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C
[CoF6]3
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D
[Co(NH3)6]3+
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Solution

The correct options are
A [NiCl4]2
C [CoF6]3
[NiCl4]2 and [CoF6]3 have 2,3 unpaired electrons and are paramagnetic complex compounds.
[Ni(CN)4]2 and [Co(NH3)6]3+ has no unpaired electrons so are diamagnetic in nature, as CN and NH3 are strong field ligands and they cause pairing of electrons.

Hence, options B and C are correct.

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