A clear aqueous solution contains nitrates of two different metals, X and Y. When this solution is mixed with aqueous NaCl, a white solid forms. This solid partially dissolves in hot water, leaving behind a residue P and producing a solution Q. Residue P dissolves in aqueous ammonia and al

Question

A clear aqueous solution contains nitrates of two different metals, X and Y. When this solution is mixed with aqueous NaCl, a white solid forms. This solid partially dissolves in hot water, leaving behind a residue P and producing a solution Q. Residue P dissolves in aqueous ammonia and also in excess sodium thiosulfate. The hot solution Q reacts with KI to produce a yellow solid. Identify the metals X and Y.

Accepted Answer

Silver and Lead. The white precipitate formed is a mixture of silver chloride (AgCl) and lead chloride (PbCl₂). PbCl₂ partially dissolves in hot water, leaving AgCl as residue P, which dissolves in ammonia and sodium thiosulfate. The hot solution Q contains Pb²⁺ ions, which react with KI to form yellow lead iodide (PbI₂).

Solution

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