chem help pleeezeee?

Question

Among the complex ions formed by Co3+ are the 4 listed below. Match each ion to its correct color.

1) [CoF6]3- A. blue
2) [Co(CN)6]3- B. yellow-orange
3) [Co(NH3)6]3+ C. pale yellow
4) [Co(H2O)6]3+ D. green

I'm pretty sure 2 is C but I don't know about the others... HELP!!!!

Answer 1

1-A
2-C
3-B
4-D