transition elements?

Question

can someone please tell me:
1) what would u get if u tested cobalt II nitrate with ammonia NH3 solution and sodium hydroxide, NaOH solution?
2)what would u get if u tested potassium dichromate with ammonia NH3 solution and sodium hydroxide, NaOH solution?
what are the products?what are the changes occur? what are the observations you can observe?
and one more thing, based on their colours,identify the transition element compound present in them.
thank you.

Answer 1

1) A ppt of Co(OH)2

2) Na2CrO4

which elements ????????