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Which among the following impurity is not added to steel?

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Which among the following impurity is not added to steel?

(a) Silicon

(b) Carbon

(c) Manganese

(d) Arsenic

This question was posed to me during a job interview.

The question is from Steel topic in section Metallurgical Industries of Chemical Technology

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Correct answer is (d) Arsenic

For explanation: Sulphur is added in steel to improve its machineability but lowers the ductility. Carbon increases the strength of steel whereas manganese increases the hardenability.

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