First slide

Crystal field theory

Question

Colour of ${[Ni {(H_{2} O)}_{6}]}^{+ 2} and {[Ni {(en)}_{3}]}^{+ 2}$ respectively will be

Difficult

A

Pink, blue
B

Green, Pink
C

Green, violet
D

Pale blue, violet

Solution

$H_{2} O$ is a weak field ligand.
$∴ {[Ni {(H_{2} O)}_{6}]}^{+ 2}$ ……. Absorbs longer wavelength …. emits green colour
Ethane 1, 2–diamine is a strong field ligand.
$∴ {[Ni {(en)}_{3}]}^{+ 2}$ …… absorbs shorter wave length ….. emits violet colour.

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