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Physical and Chemical Changes — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7SciencePhysical and Chemical Changes1 Mark
MCQ
Which of the following changes is not a physical change?
  • A
    Glowing of filament in bulb
  • ✓
    Combustion
  • C
    Boiling of water
  • D
    Sublimation
✓

Answer

Correct option: B.
Combustion
Combustion represents a chemical reaction whereby the carbon compounds are converted into different chemicals like carbon dioxide and water vapor in presence of oxygen. So this is a chemical change.
The other options are physical changes as there is no change in the chemical composition of the substances in these processes.

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