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  4. The hybridisations of Ni(CO)4 and [Cr(H2O)26]+ respectively, are

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Q. The hybridisations of $Ni(CO)_4$ and $[Cr(H_2O)^2_6]^+$ respectively, are

KVPYKVPY 2011Coordination Compounds

Solution:

The oxidation state of $Ni$ in $Ni(CO)_4$ is $O$. It’s electronic configuration will be $[Ar]3d^84s^2$
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As $CO$ is a strong field ligand, pairing of electrons will occur.
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The oxidation state of $Cr$ in $[Cr(H_2O)_6]^{2+}$ is $+2$. It’s electronic configuration will $[Ar]3d^44s^0$.
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As $H_2O$ is also a strong field ligand, pairing of electrons will occur.
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