AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
The three chief raw materials required to manufacture iron and steel are iron ore, coking coal, and limestone, required in the ratio of approximately 4:2:1.
Source: Iron and Steel Industry, Chapter 6
The passage directly states "Iron ore, coking coal and lime stone are required in the ratio of approximately 4 : 2 : 1." Examiners expect all three names mentioned correctly. Mentioning the ratio is a bonus but not compulsory for 1 mark. Manganese is also mentioned but is described as an additional/minor requirement, not one of the three chief raw materials.