Question

the element which is added to pure iron to make it strong and hard​

Answer 1

Answer:

Adding carbon to iron to make steel does make it stronger and tougher, up to a point. Then it will get stronger but less tough (ie like cast iron). Carbon strengthens iron by distorting its crystal latice.

Explanation:

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Answer 2

Answer:

Carbon in charcoal form , nickel ,alluminium etc