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Is Matter Around Us Pure ? — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure ?1 Mark
MCQ
The rusting of an iron object is called:
  • A
    Corrosion and it is a physical as well as a chemical change.
  • B
    Dissolution and it is a physical change.
  • C
    Corrosion and it is a chemical change.
  • D
    Dissolution and it is a chemical change.
✓

Answer

  1. Corrosion and it is a chemical change.

Explanation:

Rusting of iron takes place in the presence of air (O2) and water vapour. Action of air and moisture on iron converts it to its oxide. This process is called corrosion and it leads to the formation of a new compound. Therefore, it is a chemical change.

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