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Why is the reaction between barium chloride and sodium sulphate called double displacement?

Answer and explanation

Correct answer: Ions of two compounds exchange partners to form new compounds

In \(\mathrm{BaCl_2 + Na_2SO_4 \rightarrow BaSO_4\downarrow + 2NaCl}\), the ions of the two compounds exchange partners. \(\mathrm{Ba^{2+}}\) combines with \(\mathrm{SO_4^{2-}}\) to form an insoluble precipitate of \(\mathrm{BaSO_4}\), while \(\mathrm{Na^+}\) and \(\mathrm{Cl^-}\) form \(\mathrm{NaCl}\). Therefore, this is a double displacement reaction. Option A describes single displacement, in which a free element replaces an element in a compound. Exam tip: The general pattern \(\mathrm{AB + CD \rightarrow AD + CB}\) indicates a double displacement reaction.

Related tags

Class 10 ScienceChemical ReactionsDouble Displacement ReactionIonic ExchangePrecipitation ReactionBarium Sulphate

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