When an aqueous solution of barium chloride is mixed with an aqueous solution of sodium sulphate, a white precipitate is formed. What type of reaction is this?
Answer and explanation
Correct answer: Double displacement and precipitation reaction
The reaction is \(\mathrm{BaCl_2(aq) + Na_2SO_4(aq) \rightarrow BaSO_4(s) + 2NaCl(aq)}\). The \(\mathrm{Ba^{2+}}\) and \(\mathrm{SO_4^{2-}}\) ions combine to form insoluble white \(\mathrm{BaSO_4}\), while \(\mathrm{Na^+}\) and \(\mathrm{Cl^-}\) ions remain in solution. It is a double displacement reaction because ions are exchanged, and a precipitation reaction because an insoluble solid forms. It is not a displacement reaction, since no element replaces another element from its compound.
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What is the correct answer to this question?
Double displacement and precipitation reaction
Why is this the correct answer?
The reaction is \(\mathrm{BaCl_2(aq) + Na_2SO_4(aq) \rightarrow BaSO_4(s) + 2NaCl(aq)}\). The \(\mathrm{Ba^{2+}}\) and \(\mathrm{SO_4^{2-}}\) ions combine to form insoluble white \(\mathrm{BaSO_4}\), while \(\mathrm{Na^+}\) and \(\mathrm{Cl^-}\) ions remain in solution. It is a double displacement reaction because ions are exchanged, and a precipitation reaction because an insoluble solid forms. It is not a displacement reaction, since no element replaces another element from its compound.
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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