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Q.

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

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a

Ag and Pb

b

Ag and Cd

c

Cd and Pb

d

Cd and Zn

answer is A.

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Detailed Solution

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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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