The spin only magnetic moment value (in Bohr magneton units) of $C r (C O)_{6}$ is:

0

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2.84

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4.90

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5.92

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Solution

The correct option is A $0$
As $C O$ is strong field ligand,in $C r (C O)_{6}$ , $d^{2} s p^{3}$ is the hybridisation and $3 d^{6}$ has no unpaired electrons. So it has zero magnetic moment.

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