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Hexaaquanickel is green because the water ligands induce a splitting of the d orbitals in the nickel atom, resulting in energy absorption in the red region of the spectrum, giving the compound its green color. On the other hand, hexacyanonickel is colorless because the cyanide ligands do not cause d-orbital splitting, leading to the absorption of light in the ultraviolet or infrared regions of the spectrum, which does not fall within the visible range.

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