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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(A) Limestone is added to remove silica as impurity.

$CaO + {SiO}_{2} \to {CaSiO}_{3} (in the temperature range 900 - 1500 K)$

(B) Pig iron obtained from blast furnace contains $4 %$ carbon and many other impurities (eg. $S, P, Si, Mn$ ) in small amount.

In fusion zone molten iron becomes heavy by absorbing elemental impurities and produces Pig iron. (in the temperature range 900 – 1500 K)

(C) Coke $(C)$ converts ${CO}_{2}$ in $CO$ .

$C + {CO}_{2} \to 2 CO$

(D) Exhaust gases consist of $CO$ and ${CO}_{2}$ .

Exhaust gases does not contain NO₂

Hence, (A,B,C) are correct.

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