Which of the following pairs of ions will react to form a white precipitate?

  1. Na⁺ and Cl⁻
  2. Ba²⁺ and SO₄²⁻
  3. K⁺ and NO₃⁻
  4. H⁺ and OH⁻

📝 Batafsil tushuntirish

Barium sulfate (BaSO₄) is an insoluble white solid formed during an ion-exchange reaction. The other pairs remain in solution or form water.
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