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

Step-by-step solution

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 +