The spin only magnetic moment value of $C r (C O)_{6}$ is?

2.84 B . M .

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4.90 B . M .

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5.92 B . M .

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0 B . M .

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Solution

The correct option is D $0 B . M .$
$C r (C O)_{6} \Rightarrow C r^{o} \Rightarrow [A r] 4 s^{1} 3 d^{5}$
$\Rightarrow C O =$ Strong field ligand.
1. All the electrons are paired due to the strong field ligand $C O$ .
2. So, the unpaired electrons $= 0$ .
3. Magnetic moment $= \sqrt{0 (0 + 2)} = 0 B m$

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