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Physical and Chemical Changes — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7SciencePhysical and Chemical Changes1 Mark
MCQ
What is the formula of rust?
  • ✓
    $Fe_2O_3$
  • B
    $Fe_3O_4$
  • C
    $FeO$
  • D
    None of these
✓

Answer

Correct option: A.
$Fe_2O_3$
A.  $Fe_2O_3$
Explanation:
Iron metal does not burn in dry air even on strong heating. In moist air iron is slowly oxidised to give rust (iron oxide).

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