alleryRusting of iron is the formation of
AIron sulphide FeS from iron and sulphur
BHydrated iron(III) oxide Fe2O3 . x H2O
CIron carbonate FeCO3 from iron and CO2
DIron chloride FeCl3 from iron and Cl2
Answer & Solution
Correct answer: B. Hydrated iron(III) oxide Fe2O3 . x H2O
1. The chapter section on corrosion describes rust formation.
2. Iron reacts with oxygen and water in the air.
3. The product is reddish-brown hydrated iron(III) oxide.
4. So option A is correct.
_Source: Selina Concise Chemistry Class 10, Ch 7 Metallurgy (Mistral OCR'd PDF), section on rusting_
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