alleryWhen an iron nail is dipped in copper sulphate solution, iron displaces copper. What does this show?
ANeither metal is reactive at all
BCopper is more reactive than iron
CBoth metals are equally reactive
DIron is more reactive than copper
Answer & Solution
Correct answer: D. Iron is more reactive than copper
1. In a displacement reaction, metal A displaces metal B from B's salt solution if A is more reactive.
2. Here iron displaces copper from copper sulphate.
3. Therefore metallic iron is more reactive than metallic copper.
4. The opposite claim that copper is more reactive contradicts the displacement observed.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 8 "Metallurgy", p.106_
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