Question : Which of the following is not soluble in water?
Option 1: Lead sulphate
Option 2: Zinc sulphate
Option 3: Potassium sulphate
Option 4: Sodium sulphate
Correct Answer: Lead sulphate
Solution : The correct option is Lead sulphate .
Lead sulphate is considered insoluble in water and forms a solid precipitate when lead ions (Pb²⁺) and sulphate ions (SO₄²⁻) combine in a solution. The other compounds mentioned—zinc sulphate (ZnSO 4 ), potassium sulphate (K 2 SO 4 ), and sodium sulphate (Na 2 SO 4 )—are all soluble in water.
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