(a) What is corrosion?(b) Name any two metals which do not corrode easily.
(c) What is the corrosion of iron known as?
(d) Explain why, aluminium is a highly reactive metal, still it is used to make utensils for cooking.

(a) Corrosion is the action of air, moisture, or a chemical on their surface by a metal.

(b) Gold and platinum do not corrode easily.

(c) Corrosion of iron known as Rusting.

(d) Aluminium begins to corrode quickly when it comes in contact with moist air. It forms an oxide layer over the metal. This aluminium oxide is very tough and prevents the metal underneath from further corrosion. Therefore, aluminium is used for making utensils irrespective of its highly reactive property as its corrosion leads to the non-corrosion of the metal in the longer run.