Reaction of iron nail with copper sulphate solution is ___________ reaction.

combination

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displacement

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double displacement

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decomposition

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Solution

The correct option is B displacement
Iron being more reactive than copper will displace copper from its salt and form a subsequent salt of ferrous sulphate. During the reaction, the colour of copper sulphate [blue] will change to greenish-blue {ferrous sulphate}. This is an example of a Displacement reaction.

$F e (s) + C u S O_{4} (a q) ⟶ F e S O_{4} (a q) + C u (s)$

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