Why does iron replace copper when an iron nail is dipped in copper sulphate solution?
Iron is more reactive
In the reactivity series of metals, iron is placed above copper, meaning iron is more reactive than copper.
A more reactive metal can displace a less reactive metal from its salt solution, which is a displacement reaction.
When an iron nail is dipped in copper sulphate solution, iron displaces copper, forming iron sulphate and depositing copper metal.
Hence, iron replaces copper because iron is more reactive than copper.
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