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The hexaaqua complex[Ni(H(2)O)(6)]^(2+) ...

The hexaaqua complex`[Ni(H_(2)O)_(6)]^(2+)` is green, whereas the corresponding ammonia complex `[Ni(NH_(3))_(6)]^(2+)` is violet. Explain.

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`NH_(3)` is a stronger ligand than `H_(2)O`, SO `[Ni(NH_(3))]^(2+)` will absorb higher energy light than `[Ni(H_(2)O)_(6)]^(2+)`. Being green, `[Ni(H_(2)O)_(6)]^(2+)` is probably absorbing higher energy yellow green light
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