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JEE Main202324 Jan 2023Morning ShiftChemistryCoordination CompoundsActual

The d-electronic configuration of CoCl 4 2 - in tetrahedral crystal field is e m t 2 n . The sum of m and number of unpaired electrons is

Correct answer

7

Step-by-step solution

The oxidation state of Co in complex CoCl 4 2 - is x - 4 = - 2 x = + 2 Electronic configuration of C o is C 27 o = A r 4 s 2 3 d 7 So, C o + 2 = [ Ar ] 3 d 7 Since Cl - is a weak field ligand, so the given complex will have a tetrahedral geometry with following Crystal-field splitting So, value of ( m ) + (unpaired electrons) is ( 4 ) + ( 3 ) = 7 .

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