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Which reaction is an example of a double displacement reaction in which a precipitate is formed?

Answer and explanation

Correct answer: Na₂SO₄ + BaCl₂ → BaSO₄↓ + 2NaCl

Option C is a double displacement and precipitation reaction. In aqueous solution, Na⁺ and Ba²⁺ exchange partners with SO₄²⁻ and Cl⁻. Ba²⁺ combines with SO₄²⁻ to produce insoluble barium sulphate, BaSO₄, which appears as a precipitate: Na₂SO₄ + BaCl₂ → BaSO₄↓ + 2NaCl. Option A is decomposition, B is single displacement, and D is combination, so C is unambiguous.

Related tags

Chemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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