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Which of the following statement(s) is/are correct about corrosion?
I) It is the oxidative deterioration of metal
II) It can be prevented by oxidation
III) It is an electrochemical phenomenon
IV) After corrosion parent metal will become the ore of the metal

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Only I, and III

Only II, and IV

Only I and II

Only I, III and IV

answer is D.

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Detailed Solution

In corrosion, due to oxidation, the composition of the metal changes, and layers will be separated from time to time. So, this process is called deterioration.

In corrosion oxidation, a reduction process will take place so it is a electrochemical phenomenon

In iron after corrosion, the compound formed will be $F e_{2} O_{3} . X H_{2} O$ .

This is haematite ore.

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