A precipitation reaction is one in which two soluble reactants form an insoluble product. The insoluble product is a solid which usually sinks to the bottom of the liquid.
The table shows the solubility of the compounds that form when some chemicals react. The compounds that are soluble are marked with a tick
The compounds that are insoluble are marked with a cross.
Which of the following word equations represents a precipitation reaction?

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Potassium chloride + Sodium hydroxide

Mercury sulphate + Potassium nitrate

Potassium sulphate + Barium chloride

Sodium nitrate + Barium chloride

answer is C.

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Detailed Solution

Because to form BaSO₄ white precipitate is formed, i.e insoluble solid. Double displacement reaction takes place.

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