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Question

A solution is a mixture of 0.05 M KCl and 0.05 M NaI. The concentration of I in the solution when AgCl just starts to precipitate is equal to:
(KspAgCl=1010M2;KspAgI=4×1016M2)

A
4×106M
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B
2×108M
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C
2×107M
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D
8×1015M
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Solution

The correct option is C 2×107M
For AgCl precipitation,
[Ag+]=KspAgCl[Cl]=10100.05=2×109
For AgI precipation,
[Ag+]=KspAgI[I]=4×10160.05=8×1015
Thus, AgI will precipitate first. AgCl will precipitate only when,
[Ag+]=2×109
Thus, [I]Left=4×10162×109=2×107M

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