Question

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)

• A. Limestone is used to remove silicate impurity.
• B. Pig iron obtained from blast furnace contains about $4 \%$ carbon.
• C. Coke (C) converts $CO _2$ to $CO$.
• D. Exhaust gases consist of $NO _2$ and $CO$.

Answer 1

Answer: (A), (B), (C)

(A) $CaO + SiO _2 \rightarrow CaSiO _3$ (in the temperature range $900-1500 K$ )
(B) In fusion zone molten iron becomes heavy by absorbing elemental impurities and produces Pig iron. (in the temperature range $900-1500 K$ )
(C) $C + CO _2 \rightarrow 2 CO$ (in the temperature range $900-1500 K$ )
(D) Exhaust gases does not contain $NO _2$.