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A colorless aqueous solution contains nitrates of two metal, 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. NH 3 and also in excess sodium thiosulfate. The hot solution Q gave a yellow precipitate with Kl. The metals X and Y, respectively, are

1. Ag and Pb
2. Ag and Cd
3. Cd and Pb
4. Cd and Zn

Correct answer: Ag and Pb

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