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What will be the correct order for the wavelengths of absorption in the visible region of the following : [Ni(NO_(2))_(6)]^(4-),[Ni(NH_(3))_(6)]^(2+),[Ni(H_(2)O)_(6)]^(2+) |
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Answer» SOLUTION :As metal ion is fixed,the increasing FIELD strengths (CFSE values) of the ligands from the spectrochemical series are in the order : `H_(2)OltNH_(3)ltNO_(2)^(-)` Thus, the energies ABSORBED for excitation will be in the order : `[Ni(H_(2)O)_(6)]^(2+)lt[Ni(NH_(3))_(6)]^(2+)lt[Ni(NO_(2))_(6)]^(4-)` As `E=(hc)/(lambda)`, the wavelength absorbed will be in the opposite order. |
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