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Question

A solution is 0.1 M in each of PO34,SO34 and Cl ions. Solid AgNO3 is added gradually to this solution which causes no change in volume of the solution. Given Kap(AgCl)=1.8×1010, Kap(Ag2SO4)=1.21×103 and Kap(Ag3SO4)=2.7×1018.
The concentrations of first and third ions when the second ion starts precipitating, respectively, are:

A
0.1M, 0.1M
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B
6×103M,0.1M
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C
1.64×108M,0.1M
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D
2.03×1012M,1.64×108M
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Solution

The correct option is A 0.1M, 0.1M
SO24 requires 0.1M Ag+ for precipitation.
Hence, 1st and 3rd ions will have 0.1M concentration when 2nd ion (SO24) starts precipitating.

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