A colourless aqueous solution contains nitrates of two metals, X and Y. When it was added to an aqueous solution of NaCl white precipitate is formed. This precipitate was found to be partially soluble in hot water to give a residue P and a solution Q. The residue P was soluble in $a q . N H_{3}$ 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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Ag and Pb

Ag and Cd

Cd and Pb

Cd and Cu

answer is A.

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Detailed Solution

$P b C l_{2}$ is insoluble in cold water but soluble in hot water. AgCl soluble in $N H_{3}$

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