Q46 of 400 Page 192

What is corrosion ?

Corrosion is the process by which the eating up of metals by the action of air, moisture or a chemical (such as an acid) on their surface takes place.

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44 Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula. 45 Explain how, a reduction reaction of aluminium can be used for welding cracked machine parts of iron.

Write a chemical equation for the reaction involved.

 46 Name any two metals which do not corrode easily. 46 What is the corrosion of iron known as?