NEET 2015 Chemistry question
The of , AgCl, AgBr and AgI are respectively, , , , . Which one of the following salts will precipitate last if solution is added to the solution containing equal moles of NaCl, NaBr, NaI and ?
Answer: (3)
Solution
A salt starts to precipitate when its ionic product exceeds , so the salt that needs the highest precipitates last. Let each anion be present at the same concentration . For AgX (X = Cl, Br, I): , which is proportional to (AgCl),
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