GENERAL KNOWLEDGE

Detailed explanation-1: -The presence of air (oxygen) and moisture (Water) are the essential conditions for rusting to occur. When an object made of iron is exposed to moist air and water for a long time, it gets corroded and leads to the formation of a compound called ferric oxide or iron oxide F e 2 O 3 also called rust.

Detailed explanation-2: -Rusting cannot occur without both water and oxygen. Water helps iron react with oxygen by breaking up the oxygen molecule. During the initial stages of rusting, iron loses electrons and oxygen gains electrons.

Detailed explanation-3: -When iron rusts, water and oxygen in the air react with the iron to form iron oxide. In this experiment, students set up iron wool to rust in a test tube full of air, inverted in a beaker of water. As the iron wool reacts, rusts and removes the oxygen from the air, water is drawn up the tube.