First slide

Crystal field theory

Question

The colour of the complex, ${[Ni {(en)}_{3}]}^{+ 2}$ is

Moderate

A

Red
B

Violet
C

Pale blue
D

Green

Solution

Complexes containing strong field ligands absorb light of shorter wavelengths(higher frequencies) and emit their complimentary colour;
tris(ethane 1,2-diamine) Nickel(II) ion is violet coloured;

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