9.19     [Cr(NH_{3})_{6}]^{3+}is paramagnetic while [Ni(CN)_{4}]^{2-}is diamagnetic. Explain why?

Answers (1)
D Devendra Khairwa

In  [Cr(NH_{3})_{6}]^{3+} the oxidation state of the compound is +3. Its electronic configuration is d3.  Also, NH3 is a weak field ligand so the pairing of electrons will not occur.

                                   

So this compound is paramagnetic in nature.

In [Ni(CN)_{4}]^{2-} the oxidation state of the Ni is +2.  Its electronic configuration is d8.   Also, CN- is a strong field ligand so the pairing of electrons will occur.

                                

Hence the above compound is diamagnetic in nature.

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