First slide

Crystal field theory

Question

The cobalt complex which absorbs maximum wavelength of light is

Difficult

A

${[Co {({NH}_{3})}_{6}]}^{+ 3}$
B

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

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

${[{CoF}_{6}]}^{- 3}$

Solution

Wavelength of light absorbed $\propto \frac{1}{field strength of ligand}$
$\frac{strength of ligands}{{CN}^{-} > {NO}_{2}^{-} > {NH}_{3} > F^{-}}$

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