JEE MAIN - Chemistry (2020 - 6th September Morning Slot - No. 15)

The species that has a spin-only magnetic moment of 5.9 BM, is :
(Td = tetrahedral)
[MnBr4]2– (Td)
[NiCl4]2– (Td)
Ni(CO)4 (Td)
[Ni(CN)4]2– (square planar)

Explanation

JEE Main 2020 (Online) 6th September Morning Slot Chemistry - Coordination Compounds Question 185 English Explanation

$$ \therefore $$ Unpaired electrons = 5

$$ \therefore $$ $$\mu $$ = $$\sqrt {5\left( {5 + 2} \right)} $$ = 5.9 BM

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