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Question

The solubility products of AgCl and AgI are 1.1×1010 and 1.6×1016 respectively. If AgNO3 is added drop by drop the solution containing both chloride and iodide ions, then precipitated first is:

A
AgI
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B
AgNO3
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C
AgCl
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D
Both AgI and AgCl
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Solution

The correct option is A AgI
KspAgCl=1.1×1010=[S][S]
[Ag+]AgCl=(1.1)0.5×105
KspAgI=1.6×1016=[S][S]
[Ag+]AgI=(1.6)0.5×108
As less amount of Ag+is required for the precipitation of AgI so it will precipitate first.

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