alleryThe reddish substance Fe2O3.H2O that deposits on iron exposed to moist air is known as what?
AAmalgam
BPatina
CRust
DGangue
Answer & Solution
Correct answer: C. Rust
1. Iron reacts with moist air over time.
2. A reddish deposit of Fe2O3.H2O forms on its surface.
3. This substance is called rust, and the process is rusting.
4. Patina is the greenish layer on copper, not on iron, so that option is wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 8 "Metallurgy", p.115_
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