MCQ practice · SSC Chemistry Board questions · Chapter 10: Mineral Resources: Metals and Non-metals
What is hydrated ferric oxide called?
Think it through first, then pick an option.
- a Rust
- b Wax
- c Salt
- d Paraffin
Answer and explanation
Correct answer: a Rust
Iron rust is hydrated ferric oxide, Fe₂O₃.nH₂O.
Why the other options are wrong
- b Wax: Wax is not an iron compound; hydrated ferric oxide is rust.
- c Salt: Salt in the usual sense does not mean rust; the answer is rust.
- d Paraffin: Paraffin is a waxy substance, not an iron compound; the answer is rust.
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