Solutions of [Co(NH3)6]2+,[Co(H2O)6]2+ (both octahedral), and (tetrahedral) are colored. One is pink, one is blue, and [CoCI4]2-

Question:

Solutions of [Co(NH3)6]2+,[Co(H2O)6]2+ (both octahedral), and (tetrahedral) are colored. One is pink, one is blue, and [CoCI4]2- one is yellow. Based on the spectrochemical series and remembering that the energy splitting in tetrahedral complexes is normally much less than that in octahedral ones, assign a color to each complex.