The order of energy absorbed which is responsible for the color of complexes
(A) ${\left[Ni{\left({H}_{2}O\right)}_{2} ( en{)}_{2}\right]}^{2 +}$
(B) ${\left[Ni{\left({H}_{2}O\right)}_{4} ( en )\right]}^{2 +}$ and
(C) ${\left[Ni{( en )}_{3}\right]}^{2 +}$ is

Question

The order of energy absorbed which is responsible for the color of complexes (A) [Ni ( H _ 2 O) _ 2 ( en ) _ 2 ] ^ 2 + (B) [Ni ( H _ 2 O) _ 4 ( en )] ^ 2 + and (C) [Ni ( en ) _ 3 ] ^ 2 + is

Quantrex Academy · Accepted Answer

Correct answer: B. ( C ) > ( A ) > ( B )

The complexes with strong filed ligands absorbs the highest energy light than complexes with weak field ligands.

Ethylene diamine(en) is strong field ligand and ${H}_{2}O$ is the weak field ligand.

Hence, the correct order of energy absorbed is

${\left[Ni{\left(en\right)}_{3}\right]}^{2 +} > {\left[Ni{\left({H}_{2}O\right)}_{2}{\left(en\right)}_{2}\right]}^{2 +} > {\left[Ni{\left({H}_{2}O\right)}_{4}\left(en\right)\right]}^{2 +}$

The order of energy absorbed which is responsible for the color of...

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