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Physical and Chemical Changes — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7SciencePhysical and Chemical Changes1 Mark
MCQ
Stainless steel can protect iron from rusting as it contains:
  • A
    Tin
  • ✓
    Chromium
  • C
    Zinc
  • D
    Aluminium
✓

Answer

Correct option: B.
Chromium

 Stainless steel can protect the iron from rusting or corrosion as it contains high percentages $(16-36\%)$ of chromium. This element is present in sufficient quantity that when exposed to oxidizing media it forms a thin, tightly adhering, and impervious oxide layer $($predominantly $CrO)$ that stops further corrosion.

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