Question

1) Each test tube 1,2,3,4 contains an iron nail in them and have remained unattended for days observe the test tubes and answer the following questions a) what did you find ?​

Answer 1

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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 do not 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 dissolved oxygen present in water. Hence corrosion process is not take place.

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