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AIIMS 2015
Exam
AIIMS
Year
2015
Subject
Chemistry
Chapter
Electrochemistry

AIIMS 2015 · Chemistry · Electrochemistry

Assertion : Pure iron when heated in dry air is covered with a...

Assertion : Pure iron when heated in dry air is covered with a layer of rust. Reason : Rust has the composition Fe3O4\mathrm{Fe}_3 \mathrm{O}_4.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIfboth assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

D. If both assertion and reason are false.

Step-by-step solution

Dry air has no action on pure iron. Rust has the composition Fe2O3⋅xH2O\mathrm{Fe}_2 \mathrm{O}_3 \cdot x \mathrm{H}_2 \mathrm{O}.
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