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In how many of the following compounds '...

In how many of the following compounds 'd' orbital (which contains no nodal plane) is used in hybridisation of central atom/ion ?
`Fe(CO)_(5)," "MnO_(4)^(-)," "Co(C_(2)O_(4))_(3)^(-3),`
`NiCl_(2)(PPh_(3))_(2)," "PtCl_(4)^(2-)," "Ni(CN)_(4)^(-2),`
`Ni(CN)_(4)^(-4)`

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Verified by Experts

The correct Answer is:
2
`d_(z^(2))` is used in hyb. In `Fe(CO)_(5),Co(C_(2)O_(4))_(3)^(3-)`.
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