In which reaction do both double displacement and precipitation occur?
Answer and explanation
Correct answer: Mixing aqueous barium chloride and aqueous sodium sulphate
When aqueous barium chloride and aqueous sodium sulphate are mixed, their ions exchange: \(\mathrm{BaCl_2(aq) + Na_2SO_4(aq) \rightarrow BaSO_4(s) + 2NaCl(aq)}\). Insoluble white \(\mathrm{BaSO_4}\) separates as a solid precipitate. Hence, this is both a double-displacement and a precipitation reaction. In contrast, burning magnesium is a combination reaction.
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What is the correct answer to this question?
Mixing aqueous barium chloride and aqueous sodium sulphate
Why is this the correct answer?
When aqueous barium chloride and aqueous sodium sulphate are mixed, their ions exchange: \(\mathrm{BaCl_2(aq) + Na_2SO_4(aq) \rightarrow BaSO_4(s) + 2NaCl(aq)}\). Insoluble white \(\mathrm{BaSO_4}\) separates as a solid precipitate. Hence, this is both a double-displacement and a precipitation reaction. In contrast, burning magnesium is a combination reaction.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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