(a) Define corrosion, what is the nature given to corrosion of iron ? (b) Name the colour of coating formed on silver and copper when exposed to air. (c ) List two damages caused by corrosion and suggest, how these can be prevented.

(a) Define corrosion, what is the nature given to corrosion of iron ?

1.	(a) Define corrosion, what is the nature given to corrosion of iron ? (b) Name the colour of coating formed on silver and copper when exposed to air. (c ) List two damages caused by corrosion and suggest, how these can be prevented.
Answer» Solution :(a) For definition of corrosion. Corrosion of iron is known as rusting. (b) COATING DEPOSITED on the surface of silver metal is of silver sulphide `(Ag_(2)S)`. It is black in COLOUR. The coating deposited on copper surface is of basic copper carbonate `Cu(OH)_(2)CuCO_(3)`. It is GREEN in colour.