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What will be the correct order for the wavelengths of absorption in the visible region for the following:
 

    \[{{[\mathbf{Ni}{{(\mathbf{N}{{\mathbf{O}}_{\mathbf{2}}})}_{\mathbf{6}}}]}^{\mathbf{4}}},\text{ }{{[\mathbf{Ni}{{(\mathbf{N}{{\mathbf{H}}_{\mathbf{3}}})}_{\mathbf{6}}}]}^{\mathbf{2}+}},\text{ }{{[\mathbf{Ni}{{({{\mathbf{H}}_{\mathbf{2}}}\mathbf{O})}_{\mathbf{6}}}]}^{\mathbf{2}+}}?\]

CBSE | Chemistry | Class 12 | Coordination Compounds | NCERT
What will be the correct order for the wavelengths of absorption in the visible region for the following:
 

    \[{{[\mathbf{Ni}{{(\mathbf{N}{{\mathbf{O}}_{\mathbf{2}}})}_{\mathbf{6}}}]}^{\mathbf{4}}},\text{ }{{[\mathbf{Ni}{{(\mathbf{N}{{\mathbf{H}}_{\mathbf{3}}})}_{\mathbf{6}}}]}^{\mathbf{2}+}},\text{ }{{[\mathbf{Ni}{{({{\mathbf{H}}_{\mathbf{2}}}\mathbf{O})}_{\mathbf{6}}}]}^{\mathbf{2}+}}?\]

Because all of the complexes have the same metal ion, the energy absorption is determined by the ligands’ CFSE values. The ligands’ CFSE values are in the order of H2O <  NH3 < NO2– according to the spectro-chemical series.

[Ni(H2O)6]2+ <[ Ni(NH3)6] 2+  < [ Ni(NO2)6] 4−

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