AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(C) 10 kg
Nearly 10 kg of manganese is required to manufacture one tonne of steel.
This is a direct fact from the Manganese section of Chapter 5. The exact line from the textbook is: "Nearly 10 kg of manganese is required to manufacture one tonne of steel." For MCQs, simply circle/write the correct option and optionally add the supporting fact in one line.