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Question

Which of the following complexes has the highest negative energy change (ΔG)?

A
[Ni(NH3)2(H2O)4]2+
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B
[Ni(NH3)4(H20)2]2+
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C
[Ni(en)(H2O)4]2+
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D
[Ni(en)2(H2O)2]2+
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Solution

The correct option is D [Ni(en)2(H2O)2]2+
More the stability of the complex, more is the magnitude of the negative energy change. The stability of the complex is greatly enhanced by the presence of a chelating ligand. This is known as the chelate effect. Thus the complex, [Ni(en)2(H2O)2]2+ has the highest negative energy change.

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