begin mathsize 48px style M subscript 1 X space plus space M subscript 2 space equals space M subscript 2 X space plus space M subscript 1 end style

 

    M1X M2




A single replacement reaction (a.k.a single displacement reaction) will occur if M1 (cation) is less reactive than M2. The reactivity order corresponds to the reactivity series of the metals. 

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