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JEE Advanced · 2020 · 27 Sep 2020 · Paper 1 · Practical and Analytical Chemistry

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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. and also in excess sodium thiosulfate. The hot solution Q gave a yellow precipitate with KI. The metals X and Y, respectively, are
  1. (A)Ag and Pb✓ Correct
  2. (B)Ag and Cd
  3. (C)Cd and Pb
  4. (D)Cd and Zn

Answer: (A)

Solution

The white precipitate formed with NaCl contains chlorides of both metals. The precipitate being partly soluble in hot water indicates a mixture of (insoluble) and (soluble in hot water).

Residue P is , which is soluble in aqueous forming and in excess sodium thiosulfate forming .

Solution Q contains , which gives a yellow precipitate of with KI.

Therefore, X = Ag and Y = Pb.

JEE Advanced · 2020 · 27 Sep 2020 · Paper 1 · Single correct option

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