(i) Define corrosion . (ii) What is corrosion of iron called? (iii) How will you recognisethe corrosion of silver? (iv) Why corrosion of iron is a serious problem ?

(i) Define corrosion . (ii) What is corrosion of iron called? (iii)

1.	(i) Define corrosion . (ii) What is corrosion of iron called? (iii) How will you recognisethe corrosion of silver? (iv) Why corrosion of iron is a serious problem ?
Answer» Solution :(i) CORROSION is a process in which metals aredeteriorated byaction of AIR, moisture, chemicals, etc. (ii) Corrosion of iron is CALLED Rusting. (iii) Silver turns black as it reacts with `H_(2)S` present in airand forms a LAYER of `Ag_(2)S`. (iv) Corrosion of iron is a serious problem beause it leads to wastage of tonnes of iron every year and lot of money is spent to repair or REPLACE it .