Which of these reactions is not possible?

C u + A l_{2} (S O_{4})_{3} \to

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

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K + Z n C l_{2} \to

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M g + A g N O_{3} \to

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Solution

The correct option is A $C u + A l_{2} (S O_{4})_{3} \to$
All of the given reactions, except one, are displacement reactions, in which a more reactive metal displaces a less reactive metal from its salt. More reactive metals are above less reactive metals in the reactivity series.

Cu is below Al in the reactivity series. That means, Cu is less reactive than Al, so it won't displace Al. Hence, the reaction $C u + A l_{2} (S O_{4})_{3}$ is not possible.

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