Why is rusting of iron considered a chemical change?
Answer and explanation
Correct answer: A new reddish-brown substance, hydrated iron(III) oxide, is formed.
Rusting is a chemical change because iron reacts slowly with oxygen in the presence of moisture and produces a new reddish-brown material, commonly represented as hydrated iron(III) oxide. The new substance has properties different from those of iron and cannot be removed simply by reversing a shape or position change. Therefore, options B, C and D describe possible physical changes, not the chemical transformation involved in rusting.
Frequently asked questions
What is the correct answer to this question?
A new reddish-brown substance, hydrated iron(III) oxide, is formed.
Why is this the correct answer?
Rusting is a chemical change because iron reacts slowly with oxygen in the presence of moisture and produces a new reddish-brown material, commonly represented as hydrated iron(III) oxide. The new substance has properties different from those of iron and cannot be removed simply by reversing a shape or position change. Therefore, options B, C and D describe possible physical changes, not the chemical transformation involved in rusting.
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.
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