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Physical and Chemical Changes — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7SciencePhysical and Chemical Changes1 Mark
MCQ
Chemical changes are $........:$
  • A
    Temporary, reversible and a new substance is produced
  • B
    Always accompanied by exchange of light
  • ✓
    Permanent, irreversible and a new substance is produced
  • D
    Never accompanied by exchange of light and heat energy
✓

Answer

Correct option: C.
Permanent, irreversible and a new substance is produced
Chemical changes take place on the molecular level. A chemical change produces a new substance. It is a permanent and irreversible change.
Examples of chemical changes include combustion $($burning$),$ cooking an egg, rusting of an iron pan.

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