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Physical and Chemical Changes — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7SciencePhysical and Chemical Changes1 Mark
MCQ
Which among the following is not a physical change?
  • A
    Melting of solids to liquids
  • B
    Vaporisation of liquids to gasses
  • ✓
    Liquefaction of gasses to liquids
  • D
    Decay of matter
✓

Answer

Correct option: C.
Liquefaction of gasses to liquids
Melting, vapourisation and liquification all are pure physical changes where the chemical composition of the material does not change. But during the decay of matter, there occurs a permanent chemical change catalysed by living organism.

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