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  4. The spin only magnetic moment value (in Bohr's magneton units) of [.Cr(. CO .)6]. is:

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Q. The spin only magnetic moment value (in Bohr's magneton units) of $\left[\right.Cr\left(\right. CO \left.\right)_{6}\left]\right.$ is:

NTA AbhyasNTA Abhyas 2022

Solution:

In $\left[\text{C} \text{r} \left(\right. \text{C} \text{O} \left.\right)_{6}\right] , \, \text{C} \text{r}$ has $3 \text{d}^{6}$ electronic configuration which has no unpaired electrons and hence, zero magnetic moment.
CO is a strong field ligand which causes pairing up of unpaired electrons in d-orbitals of central metal atom. Solution