1.

Which two metals do not corrode easily? Give an example in each case to support that(i) corrosion of some metals is an advantage.(ii) corrosion of some metals is a serious problem.

Answer»

Gold and platinum.
(i) A thin impervious layer of aluminium oxide forms a protective layer which protects the aluminium metals underneath from further damage.
(ii) Corrosion of iron is a serious problem. Every year enormous amount of money is spent to replace damaged iron and steel structures.



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