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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

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An Intiative by Sri Chaitanya

Cd and Zn

Cd and Pb

Ag and Pb

Ag and Cd

answer is A.

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Detailed Solution

X : Ag P : AgCl

Y : Pb Q : PbCl₂

AgCl + 2NH₃ solution $\to$ [Ag(NH₃)₂]Cl
(P) (excess) clear solution
AgCl + 2Na₂S₂O₃ solution $\to$ Na₃ [Ag(S₂O₃)₂] + NaCl
(P) (excess) clear solution
PbCl2 + 2KI $\to$ PbI₂ $↓$ + 2KCl
Hot solution (yellow ppt)
(Q)

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