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Aluminium is a more active metal than iron, but suffers less corrosion. Why?

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Question

Aluminium is a more active metal than iron, but suffers less corrosion. Why?

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Solution

When aluminium is exposed to atmospheric air, it combines with oxygen, and a film of aluminium oxide (Al2O3) is formed at the surface. This hard, tightly adhering film prevents corrosion.

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Chapter 7: Metallurgy - EXERCISE-7C [Page 133]

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S.P. Singh Concise Chemistry [English] Class 10 ICSE
Chapter 7 Metallurgy
EXERCISE-7C | Q 10. (a) | Page 133
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