Question

Which makes iron hard and strong ?

Answer 1

Answer:

Cementite (iron carbide): Iron with much more carbon (and sometimes other elements) that is very hard and brittle. ... Graphite: Pure carbon crystals, which make iron alloys hard and brittle.Cementite (iron carbide): Iron with much more carbon (and sometimes other elements) that is very hard and brittle. ... Graphite: Pure carbon crystals, which make iron alloys hard and brittle.

Answer 2

Explanation:

The correct answer is carbon .