A colorless aqueous solution contains nitrates of two metals, X and 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. $$NH3$$ and also in excess sodium thiosulfate. The hot solution Q gave a yellow precipitate with KI. The metals X and Y, respectively, are

Question

Infinity Learn · Accepted Answer

X : Ag                   P : AgCl Y : Pb                  Q : $$PbCl2$$ AgCl $$+$$ $$2NH3$$ solution → [$$Ag(NH3)2$$]$$Cl(P)$$      (excess)                 clear solutionAgCl $$+$$ $$2Na2S2O3$$ solution → $$Na3$$ [$$Ag(S2O3)2$$] $$+$$ $$NaCl(P)$$       (excess)                        clear solution $$PbCl2$$    $$+$$     $$2KI$$    →      $$PbI2$$ ↓ $$+$$ $$2KClHot$$ solution                      (yellow$$ $$ppt) (Q)

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