Question -
Answer -
The central metal ion in all the threecomplexes is the same. Therefore, absorption in the visible region depends onthe ligands. The order in which the CFSE values of the ligands increases in thespectrochemical series is as follows:
H2O< NH3 < NO2−
Thus, the amount of crystal-field splittingobserved will be in the following order:
Hence, the wavelengths of absorption in thevisible region will be in the order:
[Ni(H2O)6]2+ >[Ni(NH3)6]2+ >[Ni(NO2)6]4−