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Physical and Chemical Changes — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7SciencePhysical and Chemical Changes1 Mark
MCQ
Rusting of iron is a chemical change because:
  • A
    It is temporary
  • B
    It can be cleaned and the original substance recovered
  • C
    Burning of matchstick
  • ✓
    A new substance is formed
✓

Answer

Correct option: D.
A new substance is formed
A change in which one or more new substances are formed is known as chemical change. When the iron is exposed to air and moisture, rust formation takes place. Rust is nothing but iron oxide; a new substance formed out of the reaction. The colour of the surface of the iron also changes. Hence, rusting of iron is a chemical change.

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