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Question 600433
JEE Chemistry · Hard

Chemical and Ionic Equilibrium: Selective precipitation MCQ

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Selective precipitationHardQuestion 600433

Question

A solution contains 0.1 M each of Cl⁻ and I⁻. If AgNO₃ is gradually added, which precipitates first? Ksp(AgCl) = 1.8×10⁻¹⁰, Ksp(AgI) = 1×10⁻¹⁶.
  1. A
    AgCl (lower Ksp)
  2. B
    AgI (lower Ksp)
    Correct
  3. C
    Both precipitate together
  4. D
    Neither precipitates

Correct answer

AgI (lower Ksp)

Explanation

AgI has much lower Ksp → needs much less Ag⁺ to start precipitation. [Ag⁺] to start AgI precipitation = Ksp/[I⁻] = 10⁻¹⁵. To start AgCl: = 1.8×10⁻⁹. AgI precipitates first.

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