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Solution


Q.

The order of energy absorbed which is responsible for the colour of complexes

A)  [Ni(H2O)2(en)2]2+
B)  [Ni(H2O)4(en)]2+
C)  [Ni(en)3]2+            is                                [2022]
1 (A) > (B) > (C)  
2 (C) > (B) > (A)  
3 (C) > (A) > (B)  
4 (B) > (A) > (C)  

Ans.

(3)

Chelating ligand increases the stability of complex compound and higher the number of chelating ligands, higher will be the stability. Stronger is the strength of ligand, greater is the energy absorbed by the complex. Hence, the order is :  

[Ni(en)3]2+C > [Ni(H2O)2(en)2]2+A > [Ni(H2O)4(en)]2+B