An excess of aqueous ammonia is added to three different flasks (...

An excess of aqueous ammonia is added to three different flasks ( $F_1, F_2, F_3$ ) containing aqueous solutions of $\mathrm{CuSO}_4, \mathrm{Fe}_2$\left(\mathrm{SO}_4\right)_3$and$\mathrm{NiSO}_4$respectively. Which of the following is correct about this addition? I. A precipitate will be formed in all three flasks II. Ammonia acts as a base as well as a ligand exchange reagent in$F_1$and$F_3$III. A soluble complex of$\mathrm{NH}_3$and the metal ion is formed in$\mathrm{F}_1$and$\mathrm{F}_3$IV. A precipitate will be formed only in$F_2