Assertion : Pure iron when heated in dry air is covered with a layer of rust. Reason : Rust has the…

Assertion : Pure iron when heated in dry air is covered with a layer of rust. Reason : Rust has the composition $\mathrm{Fe}_3 \mathrm{O}_4$.
  1. If both assertion and reason are true and reason is the correct explanation of assertion.
  2. Ifboth assertion and reason are true but reason is not the correct explanation of assertion.
  3. If assertion is true but reason is false.
  4. If both assertion and reason are false.

Solution

Dry air has no action on pure iron. Rust has the composition $\mathrm{Fe}_2 \mathrm{O}_3 \cdot x \mathrm{H}_2 \mathrm{O}$.

Asked in: NEET 2016 (Phase 1)

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