A solution of [Ni(H2O)6]2+ is green but a solution of [Ni(CN)4]2– is colourless. Explain
In case of [Ni(CN)4]2– , Ni is again in +2 stat with the configuration 3d8 but in presence of the strong CN– ligand, the two unpaired electrons in the 3d orbitals pair up. Thus, there is no unpaired electron present. Hence, it is colourless.
