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Q.

A sample of sparingly soluble ${PbI}_{2} (s)$ containing radioactive I - 133 is added to 0.10 M KI(aq) and stirred overnight. Observations about this system include which of the following?
(P) The radioactivity of the liquid phase increases significantly.
(Q) The concentration of the $I^{-}$ ion in solution increases significantly.

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a

P only

b

R only

c

Both P and Q

d

Neither P nor Q

answer is A.

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Detailed Solution

The precipitate isn't merely statically submerged in the solution; some of the ions (or molecules) in the solution are dissolving and some are precipitating out. Therefore, there will be an ion exchange between those in the precipitate and those in the solution for salt like ${PbI}_{2}$ .

Hence the correct option is A.

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