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The Ksp of Ag2CrO4, AgCl, AgBr, and AgI are respectively, 1.1 × 10⁻¹², 1.8 × 10⁻¹⁰, 5.0 × 10⁻¹³, 8.3 × 10⁻¹⁷. Which one of the following salts will precipitate last if AgNO3 solution is added to the solution containing equal moles of NaCl, NaBr, NaI, and Na2CrO4?

1. AgCl
2. AgBr
3. Ag2CrO4
4. AgI

Correct answer: AgCl

Solution

The salt with the highest Ksp value will precipitate last because it is the most soluble. Among the given salts, AgCl has the highest Ksp (1.8 × 10⁻¹⁰), so it will precipitate last.

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