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A 2.0 mL sample of a colourless solution, when treated with a few drops of 2 M hydrochloric acid, forms a white precipitate which dissolves when the solution is heated to boiling. The original solution could have contained which of the following cations?
(P) $0.1 M {Ag}^{+}$ (Q) $0.1 M {Pb}^{2 +}$

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P only

Q only

Neither P nor Q

Either P or Q

answer is B.

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Detailed Solution

When a 2.0 mL sample of a colourless solution is treated with a few drops of 2 M hydrochloric acid, a white precipitate appears that dissolves when heated to boiling. The original solution contains $0.1 {MPb}^{2 +}$ .

Hence the correct option is B

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