question_answer 42)

What will be the correct order for the wavelengths of absorption in the visible region of the following : [Ni(NO2)6]4–, [Ni(NH3)6]2+, [Ni(H2O)6 ]2+

Answer:

As metal ion is fixed, the increasing field strengths (CFSE values) of the ligands from the spectrochemical series are in the order : H2O < NH3< NO2? Thus, the energies absorbed for excitation will be in the order : [Ni(H2O)6 ]2+< [Ni(NH3)6]2+< [Ni(NO2)6 ]4? As E = the wavelength absorbed will be in the opposite order.