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Q.

A colourless solution is known to contain one of these ions. Which ion is present if adding dilute HCl produces a white precipitate that dissolves when the solution is warmed?

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a

Hg22+

b

Ag+

c

Pb2+

d

Cu2+

answer is D.

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Detailed Solution

All of the given cations are group -1 cations, and when HCl is added to their aqueous solution, they will precipitate their corresponding chlorides

Ag+(aq)+HCl(aq)AgCl(s)+H+(aq)Cu2++(aq)+2HCl(aq)CuCl2(s)+2H+(aq)Hg22++(aq)+2HCl(aq)Hg2Cl2(s)+2H+(aq)Pb2++(aq)+2HCl(aq)PbCl2(s)+2H+(aq)

All the precipitates are insoluble in cold water but out of all these only lead (II) chloride is soluble in warm water.

Hence the correct option is D

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A colourless solution is known to contain one of these ions. Which ion is present if adding dilute HCl produces a white precipitate that dissolves when the solution is warmed?