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The correct order for the wavelength of absorption in the visible region is:

  1. A
  2. B
  3. C
    [\text{Ni}(\text{NO}_2)_6]^{4-}$
  4. D
    [\text{Ni}(\text{NO}_2)_6]^{4-}$

Solution & Step-by-step Explanation

Energy of absorption () is inversely proportional to wavelength (): . The crystal field splitting energy () depends on the field strength of the ligands.From spectrochemical series: (Increasing field strength/energy).Therefore, Energy order: Wavelength order (): .

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The correct order for the wavelength of absorption in the visible region is:
A
B
C
[\text{Ni}(\text{NO}_2)_6]^{4-}$
D
[\text{Ni}(\text{NO}_2)_6]^{4-}$

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