What substance is formed on iron during rusting?
Answer and explanation
Correct answer: Reddish-brown, flaky substance
During rusting, iron reacts slowly with oxygen in the presence of water or moisture and forms hydrated iron(III) oxide. This corrosion product is called rust and appears as a reddish-brown, flaky coating, so option A is correct. It is a solid deposit, not a blue liquid or green gas; the appearance also does not match a bright white solid.
Frequently asked questions
What is the correct answer to this question?
Reddish-brown, flaky substance
Why is this the correct answer?
During rusting, iron reacts slowly with oxygen in the presence of water or moisture and forms hydrated iron(III) oxide. This corrosion product is called rust and appears as a reddish-brown, flaky coating, so option A is correct. It is a solid deposit, not a blue liquid or green gas; the appearance also does not match a bright white solid.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
