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Question

The Ksp of Ag2CrO4, AgCl, AgBr and Agl are respectively, 1.1×1012, 1.8×1010, 5.0×1013,. Which of these will precepitate last if AgNO3 solution is added to a solution containing equal moles of NaCl, NaBr, NaI and Na2CrO4?

A
AgBr
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B
Ag2CrO4
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C
AgI
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D
AgCI
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Solution

The correct option is B Ag2CrO4
The one that has the highest solubility would precipitate out first.

Ksp of Ag2CrO4 would be 4s3
Ksp of AgCl, AgBr, AgI would be s2
Solving for the values of s for all of these compounds, Ag2CrO4 has the highest value.

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