alleryWhat is added in small quantity to harden steel?
AManganese
BMagnesium
CMolybdenum
DMonazite
Answer & Solution
Correct answer: A. Manganese
1. The main charge of a steel plant is iron ore, coking coal and limestone.
2. Some quantities of manganese are also required.
3. Manganese is what hardens the steel.
_Source: syllabus Social Science, 'Contemporary India II', Ch 6 'Manufacturing Industries'_
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