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Question

On addition of AgNO3 slowly to 0.1 M each of NaCl and NaBr in a solution, what percentage of Br ions get precipitated when Cl ion starts precipitating ?
KSP(AgCl)=1.0×1010 KSP(AgBr)=1×1013

A
0.11
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B
99.9
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C
0.01
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D
9.99
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Solution

The correct option is B 99.9
For precipitation of AgCl,
[Ag+] required=KSP(AgCl)[Cl]=1.0×10100.1=1.0×109 M
[Br] left=KSP(AgBr)[Ag+]=1.0×10131.0×109=1.0×104 M
% of remaining, [Br]=1.0×1040.1×100=0.1
% of [Br] which get precipitated =1000.1=99.9

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