Which one of the following is a double displacement reaction?

F e + C u S O_{4} \to F e S O_{4} + C u

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A g N O_{3} + N a C l \to A g C l + N a N O_{3}

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2 M g + O_{2} \to 2 M g O

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2 K C l O_{3} \to 2 K C l + 3 O_{2}

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Solution

The correct option is B $A g N O_{3} + N a C l \to A g C l + N a N O_{3}$
Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions.
In option (ii), $A g^{+}$ ion combines with $C l^{-}$ ion and $N O_{3}^{-}$ ion combines with $N a^{+}$ ion to form two new compounds as silver chloride $(A g C l)$ and sodium nitrate $(N a N O_{3})$ respectively.

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