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Lanthanides Electronic Configuration

Which of the ...

Question

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

[Ni(CN)

_{4}

]

^{2 -}

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[NiCl

_{4}

]

^{2 -}

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[CoF

_{6}

]

^{3 -}

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[Co(NH

_{3}

)

_{6}

]

^{3 +}

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Solution

The correct options are
A [NiCl $_{4}$ ] $^{2 -}$
C [CoF $_{6}$ ] $^{3 -}$
[NiCl $_{4}$ ] $^{2 -}$ and [CoF $_{6}$ ] $^{3 -}$ have 2,3 unpaired electrons and are paramagnetic complex compounds.

[Ni(CN) $_{4}$ ] $^{2 -}$ and [Co(NH $_{3}$ ) $_{6}$ ] $^{3 +}$ has no unpaired electrons so are diamagnetic in nature, as $C N a n d N H_{3}$ are strong field ligands and they cause pairing of electrons.

Hence, options $B a n d C$ are correct.

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