Name two metals which do not correct easily . Give an example in each of the following case to support that : (i) Corrosion of some metals is an advantage. (ii) Corrosion of a metal is a serious problem .

Name two metals which do not correct easily . Give an example in each

1.	Name two metals which do not correct easily . Give an example in each of the following case to support that : (i) Corrosion of some metals is an advantage. (ii) Corrosion of a metal is a serious problem .
Answer» Solution :Gold and PLATINUM. (i) Corrosion of aluminium is useful . A PROTECTIVE layer of aluminium oxide is FORMED on the surface of the METAL which renders the ,etal passive and presents it from further corrosion . (ii) Corrosion of iorn is serious PROBLEM. Every yearlarge amount of money is spent to replace damaged iron and steel structures. Here corrosion is a serious problem.