A colorless aqueous solution contains nitrates of two metals, Xand Y When it was added to an aqueous solution of NaCl, a…

A colorless aqueous solution contains nitrates of two metals, Xand Y When it was added to an aqueous solution of NaCl, a white precipitate was formed. This precipitate was found to be partly soluble in hot water to give a residue P and a solution Q The residue P was soluble in aq. \(\mathrm{NH}_3\) and also in excess sodium thiosulfate. The hot solution \(\mathbf{Q}\) gave a yellow precipitate with \(\mathrm{KI}\). The metals X and Y, respectively, are