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Q. The difference between spin only magnetic moment values of $\left[ Co \left( H _2 O \right)_6\right] Cl _2$ and $\left[ Cr \left( H _2 O \right)_6\right] Cl _3$ is _____

JEE MainJEE Main 2022Coordination Compounds

Solution:

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number of unpaired $e ^{-}=3$
$\mu=\sqrt{15} BM$
Difference in spin only magnetic moment
$=0$