First slide

Bonding between metal and ligand

Question

Pair of complexes, which do not have equal number of unpaired electron(s) ?

Moderate

A

${[Co (CO)_{4}]}^{-}, {[Ni (CN)_{4}]}^{4 -}$
B

${[Co {(H_{2} O)}_{6}]}^{3 +}, {[{NiF}_{6}]}^{2 -}$
C

${[Ni (en)_{3}]}^{2 +} {[Cr (CN)_{6}]}^{4 -}$
D

${[Co (CN)_{6}]}^{4 -}, {[Cr {({NH}_{3})}_{6}]}^{3 +}$

Solution

$\begin{array}{l} {[Co (CN)_{6}]}^{4 -} \\ {Co}^{2 +}, d^{7}, SFL \end{array}$

$\begin{array}{l} {[Cr {({NH}_{3})}_{6}]}^{3 +} \\ {Cr}^{3 +}, d^{3}, SFL \end{array}$

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