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Question 600074
JEE Chemistry · Hard

Mole Concept and Stoichiometry: Stoichiometry MCQ

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StoichiometryHardQuestion 600074

Question

A solution contains 0.1 mol each of Ba²⁺, Ca²⁺, and SO₄²⁻ ions. After precipitation of BaSO₄ and CaSO₄, the moles of SO₄²⁻ remaining are:
  1. A
    0 mol
    Correct
  2. B
    0.1 mol
  3. C
    0.2 mol
  4. D
    0.05 mol

Correct answer

0 mol

Explanation

0.2 mol cations (Ba²⁺ + Ca²⁺) require 0.2 mol SO₄²⁻, but only 0.1 mol SO₄²⁻ available. SO₄²⁻ is limiting → it is completely consumed. Remaining SO₄²⁻ = 0 mol. (Note: Ksp considerations may leave trace SO₄²⁻ in practice, but for stoichiometric purposes = 0.)

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