Ligands? please urgent!?

1- which of the following nitrogen compounds or ions, [NH4]+, NH3, [NH2]- be a ligand? y?

2-[Ni(H2O)6]2+(aq) + NH3(aq) <---> [Ni(NH3)6]2+(aq) + 6H2O(l)
this equation describes a reaction in which all six water ligands are replaced by six ammonia molecules. What is the formula of a complex ion that would from if only 2 ligands were exchange?

Answer:
1- it's NH3 because it has the lone pair of electrons available for coordination

2 - -[Ni(H2O)4(NH3)2]2+(aq) <- all you have to do is replace 2 of the waters with ammonia

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