The -electronic configuration of in a tetrahedral crystal field is . Sum of ''m'' and ''number of unpaired electrons'' is __________ . [2023]

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Solution

Q.
The $d$ -electronic configuration of ${[{CoCl}_{4}]}^{2 -}$ in a tetrahedral crystal field is $e^{m} t_{2}^{n}$ . Sum of ''m'' and ''number of unpaired electrons'' is __________ . [2023]

Ans.
(7)

E.C. of ${Co}^{2 +} = 3 d^{7} 4 s^{0},$

$∵$ ${Cl}^{-} is a weak field ligand, hence pairing does not occur.$

$From CFSE in Td complex,$

$E.C. = e^{4} t_{2}^{3}$

$From question, m = 4, n = 3$

$∴$ $m + n = 7$

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