An iron nail dipped in copper sulphate solution turns brown. This is due to which one of the following types of reactions ?
Addition reaction
Decomposition reaction
Substitution reaction
Displacement reaction
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UPSC NDA-1 – 2023
This reaction involves a more reactive metal (iron, Fe) displacing a less reactive metal (copper, Cu) from its salt solution (copper sulphate, CuSO4). The general form of a displacement reaction involving metals is A + BX → AX + B, where A is more reactive than B.