Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved? (i) Displacement reaction (ii) Precipitation reaction (iii) Combination reaction (iv) Double displacement reaction (a) (i) only (b) (ii) only (c) (iv) only (d) (ii) and (iv)

Answer: (d) (ii) and (iv)

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. The reaction is an example of a double displacement reaction since ammonium and barium are getting displaced from their respective salts. The chemical equation can be represented as

Aluminium sulphate + Barium chloride → Aluminum chloride + Barium sulphate

Al2(SO4)3 + 3BaCl2→ 2AlCl3 + 3BaSO4

The reaction is also known as a precipitation reaction due to the formation of a white precipitate of barium sulphate. Rest other products formed are soluble in water except barium sulphate that precipitates out.

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