It is an alloy of iron and carbon

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Multiple Choice

It is an alloy of iron and carbon

Explanation:
Iron combined with carbon forms steel. The carbon atoms sit in the iron lattice and impede the movement of dislocations, which makes the metal stronger and harder than pure iron. Varying the carbon content changes properties: more carbon generally increases hardness and strength but can reduce ductility, while less carbon keeps steel more pliable. The other options aren’t iron-based alloys: bronze is copper with tin, brass is copper with zinc, and solder is typically tin-based used for joining metals—not for structural strength like steel. Hence, steel is the alloy that is iron plus carbon.

Iron combined with carbon forms steel. The carbon atoms sit in the iron lattice and impede the movement of dislocations, which makes the metal stronger and harder than pure iron. Varying the carbon content changes properties: more carbon generally increases hardness and strength but can reduce ductility, while less carbon keeps steel more pliable.

The other options aren’t iron-based alloys: bronze is copper with tin, brass is copper with zinc, and solder is typically tin-based used for joining metals—not for structural strength like steel. Hence, steel is the alloy that is iron plus carbon.

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