Question

define corrosion what is corrosion of iron called in which two ways corrosion of iron can be prevented

Answer 1

corrosion is gradual degradation of metal, stone or other substance due to chemical reaction on coming in contact with the environment. metals corrode or deteriorate on coming in contact with air and moisture and a chemical reaction takes places which converts the metal to oxide, sulfide or hydroxide. 

corrosion of iron is called rusting. 

corrosion of iron can be prevented by
1. painting the surface so it does not come in contact with air or water.
2. galvanising or coating iron surface with a thin layer of zinc. 

Answer 2

*the phenomena of a metal getting tarnished when exposed to air , water or any substances around it in the atmosphere is called corrosion ,

----->the formation of oxide , carbonate and sulphide layer on the metal                                                             surface when the metal is exposed to the moist atmosphere is termed as corrosion .

* the corrosion of iron called as rusting .

* prevention

a. by galvanisation

b. by painting