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The order of energy absorbed which is responsible for the color of complexes (A) [Ni(H2O)2(en)2]2+[Ni(H_2O)_2(en)_2]^{2+} (B) [Ni(H2O)4(en)]2+[Ni(H_2O)_4(en)]^{2+} and (C) [Ni(en)3]2+[Ni(en)_3]^{2+} is

A

(A) > (B) > (C)

B

(C) > (B) > (A)

C

(C) > (A) > (B)

D

(B) > (A) > (C)

Step-by-Step Solution

Stronger the field strength of ligand, higher will be the energy absorbed by the complex. The field strength order of ligands is en>H2Oen > H_2O. Therefore, the order of energy absorbed will be: [Ni(en)3]2+>[Ni(H2O)2(en)2]2+>[Ni(H2O)4(en)]2+[Ni(en)_3]^{2+} > [Ni(H_2O)_2(en)_2]^{2+} > [Ni(H_2O)_4(en)]^{2+}, i.e., (C) > (A) > (B).

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