Explanation:

Almost all sectors of the Indian industry depend heavily on the iron and steel industry for their basic infrastructure. The other raw materials besides iron ore and coking coal,essential for iron and steel industry are limestone, dolomite, manganese and fire clay. Hence options 1, 2 and 3 are correct.

• Coking coal is a vital ingredient in the steel making process as iron occurs only as iron oxides in the earth's crust. Hence, the ores must be converted, or 'reduced', using carbon. The primary source of this carbon is coking coal.
• Limestone is used as a slag former for removing impurities in the extraction of iron ore.
• Dolomite is used as a slag former, slag modifier and as a refractory material.
• Manganese removes oxygen and sulfur when iron ore (an iron and oxygen compound) is converted into iron. It also is an essential alloy that helps convert iron into steel.
• Fire clay is used in the iron and steel industry as it can withstand high temperature and used for making refractories.