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

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

Aicharya · Accepted Answer

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

${[Ni {(en)}_{3}]}^{2 +} > {[Ni {(H_{2} O)}_{2} {(en)}_{2}]}^{2 +} > {[Ni {(H_{2} O)}_{4} (en)]}^{2 +}$

The order of energy absorbed which is responsible for the color of complexes (A) Ni H 2 O 2 ( en ) 2 2 + (B)…

Solution