Which of the following defines a double displacement reaction?

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Salt metathesis reaction

Decomposition reaction

Exchange reaction

Oxidation reaction

answer is A.

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Detailed Solution

A double displacement reaction is defined as a salt metathesis reaction.
A salt metathesis reaction is called a double displacement or precipitation reaction. A double displacement reaction is when two reactant compounds react by exchanging their ions and creating two new substances. For example, a white precipitate is observed due to a double displacement reaction when barium chloride solution is mixed with copper sulphate solution.
BaCl2 + CuSO4 → BaSO4 + CuCl2

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