An iron nail dipped in copper sulphate solution turns brown. This is due to which one of the following types of reactions?
- A. Addition reaction
- B. Decomposition reaction
- C. Substitution reaction
- D. Displacement reaction ✓
Correct Answer: D. Displacement reaction
Explanation
Iron is more reactive than copper, so it displaces copper from copper sulphate solution, forming iron sulphate and leaving brown copper on the nail.
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