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Most Important Selected Qs for JEE AdvancedChemistryIonic Equilibrium

Paragraph: A solution is 0.1 M in each KCl , KBr and K ₂ CrO ₄ . To this solution solid AgNO ₃ is gradually added. Assume no change in the volume of the solution. aligned & Given K _ sp ( AgCl )=1.7 10⁻¹⁰ & ~K _ sp ( AgBr )=5 10⁻¹³ & and _ spp ( Ag ₂ CrO ₄ )=1.9 10⁻¹² aligned Question: The concentration of first ion when the second ion starts precipitating is about:

Options

  1. A0.1 M
  2. B0.03 M
  3. C0.003 M
  4. D0.0003 M

Correct answer

D. 0.0003 M

Step-by-step solution

When Cl ⁻ starts precipitating [ Br ⁻ ]= K _ sp ( AgBr ) [ Ag ⁺ ] = 5 10⁻¹³ 1.7 10⁻⁹ =3 10⁻⁴ M

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