2 (a) Describe the four main categories of steel and give one example each of their applications. [6 Marks] 2 (b) List three (3) waste products that are associated with iron and steel manufacturing process. [3 Marks] 2 (c) Make your research and write the names of two major producers of caustic soda in Jubail Industrial City including their annual production capacity and all grades of caustic soda they produce. [3 Marks] Company Name Annual Production Capacity Grades of Caustic Soda 2 (d) Make your search online and identify one type of membrane that is used in membrane cell process of manufacturing caustic soda. List two properties of the membrane and the materials from which the membrane is made from. [5 Marks] 2 (e) Explain the working principle of BOF. [5 Marks]