A) Steel
B) Wrought iron
C) Grey cast iron
D) White cast iron
Correct Answer: B
Solution :
We know that grey cast iron and white cast iron contain 2.5 to 4.5% carbon together with some sulphur, phosphorus, silicon and manganese and steel contain0.4 to 1.5% impurities while wrought iron contains not more than 0.5% of carbon and other impurities Therefore, wrought iron is the purest form of iron.
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