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Question

The melting point is the lowest for

A.

Low carbon steel

B.

High carbon steel

C.

Cast iron

D.

Wrought iron

Answer ( Option C)

Cast iron

Solution

Cast iron has the lowest melting point.

Factors affecting melting point are :

1. The covalent bond forms between Fe and C having weaker interaction as compared to Fe - Fe  interaction. This decreases the melting point as these bonds breaks easily.

2.Alloying content increase causes decrease in melting point.

Hence, the correct option is (C).

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