State which of the following chemical reactions will take place or not, giving suitable reason for each:
$(a) Z n_{(s)} + C u S o_{4 (a q)} \to Z n S O_{4 (a q)} + C u_{(s)}$
$(b) F e_{(s)} + Z n S O_{4 (a q)} \to F e S O_{4 (a q)} + Z n_{(s)}$
$(c) Z n_{(s)} + F e S O_{4 (a q)} \to Z n S O_{4 (a q)} + F e_{(s)}$

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Solution

$Z n_{(s)} + C u S O_{4 (a q)} \to Z n S O_{4 (a q)} + C u_{(s)}$ and $Z n_{(s)} + F e S O_{4 (a q)} \to Z n S O_{4 (a q)} + F e_{(s)}$ is possible as $Z n$ is more reactive than $C u$ and $F e$ respectively and hence can replace them from their respective salt solutions. Whereas $F e_{(s)} + Z n S O_{4 (a q)} \to F e S O_{4 (a q)} + Z n_{(s)}$ will not happen as $F e$ is less reactive than $Z n$ .

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