Question

Three experiments to study the process of rusting are given below. Observe the three test tubes and answer the following questions.


A. Why the nail in the test tube 2 is not rusted ?
B. Why is the nail in the test tube 1 is rusted highly ?
C. Would the nail in the test tube 3 get rusted ?

Answer 1

a.Essential requirement for corrosion are:

• Supply of oxygen
• Presence of water
• Material itself

a.The nail in the test tube 2 is not rusted because in test tube 2, we take boiling water. So, all the dissolved oxygen is removed from water and if the iron nail donot get supply of oxygen then corrosion is not carried out.

b.The nail in the test tube 1 is rusted highly because in the test tube 1, iron nail meets with all the requirements which is essential for the process of corrosion. That's Supply of oxygen in dissolved form, presence of water and material itself.

c.The nail in the test tube 3 is not rusted because calcium chloride is one of the best absorbent. So, it absorbs all the dissoved oxygen present in water. Hence corrosion process is not take place.