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The correct option(s) related to the extraction of iron from its ore in the blast furnace operating in the temperature range 900-1500 K is (are)

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Exhaust gases consist of $N O_{2}$ to $C O$ .

Limestone is used to remove silicate impurity.

Pig iron obtained from blast furnace contains about 4% carbon

Coke (C) converts $C O_{2}$ to $C O$ .

answer is A, B, C.

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Exhaust gases do not contain $N O_{2}$

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