(a) Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.

(b) Carbonate and sulphide ores are usually converted into oxides during the process of extraction

Answer:

(a) Aluminium creates a nonreactive surface of aluminium oxide on its surface. Other compounds cannot react with aluminium because of the coating. As a result, aluminium is utilised to make cooking utensils.

(b) It is simple to convert metal oxide to free metal. Furthermore, because it is easier to acquire metals directly from their oxides rather than their carbonates or sulphides, the carbonate and sulphide ores must first be converted to oxides before the metals can be extracted.