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Physical and Chemical Changes — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7SciencePhysical and Chemical Changes1 Mark
MCQ
What are the essential conditions for rusting to take place?
  • A
    Presence of pure water
  • ✓
    Presence of oxygen
  • C
    Presence of water
  • D
    Presence of oxygen alone is enough
✓

Answer

Correct option: B.
Presence of oxygen
Rust is a general term for a series of iron oxides, usually, red oxides, formed by the reaction of iron with oxygen in the presence of water or air moisture.
So the presence of impure water and oxygen are required to form rust from metal iron.

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