First slide

Bonding between metal and ligand

Question

Which is low spin complex?

Moderate

A

${[Fe (CN)_{6}]}^{3 -}$
B

${[Co {({NO}_{2})}_{6}]}^{3 -}$
C

${[Mn (CN)_{6}]}^{3 -}$
D

All of these

Solution

${CN}^{-}, {NO}_{2}^{-} are strong field ligands .$
$\begin{array}{ll} {[Fe (CN)_{6}]}^{3 -} \to 1 unpaired electron; MM \to \sqrt{3} BM \\ {[Co {({NO}_{2})}_{6}]}^{3 -} \to 0 unpaired electron; MM \to 0 BM \\ {[Mn (CN)_{6}]}^{3 -} \to 2 unpaired electrons; MM \to \sqrt{8} BM \end{array}$
All are low spin complex.

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