Question

Assertion : Pure iron when heated in dry air is covered with a layer of rust.
Reason : Rust has the composition $Fe_3O_4$.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (D)

Dry air has no action on pure iron. Rust has the composition Fe₂O₃.xH₂O.