Which of these is a chemical change?
ARusting of iron
BBoiling water
CStretching a rubber band
DCrushing a can
Answer & Solution
Correct answer: A. Rusting of iron
1. Rusting forms a new compound, iron oxide, from iron and oxygen.
2. The original iron cannot be recovered easily.
3. The other changes are physical: phase, shape or arrangement only.
4. So rusting is the chemical change.
_Source: Selina Concise Physics ICSE Class 8, Ch 1 'Matter'_
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