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When an iron nail is dipped in copper sulphate solution, iron displaces copper and copper deposits on the nail. This reaction is classified as a:
Asingle displacement reaction
Bcombination reaction
Cdouble displacement reaction
Dneutralization reaction
Answer & Solution
Correct answer: A. single displacement reaction
1. The reaction is between an element (iron) and a compound (copper sulphate).
2. The more active element (iron) replaces one element (copper) from the compound, giving a new compound and a free element.
3. Replacing one element of a compound by an element is a single displacement reaction; a double displacement would interchange ions between two compounds.
4. Therefore it is a single displacement reaction.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 10 Types of Chemical Reactions "Single Displacement Reactions", p.148_
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