JEE Advance - Chemistry (2022 - Paper 2 Online - No. 12)
The correct option(s) related to the extraction of iron from its ore in the blast furnace operating in the temperature range $900-1500 \mathrm{~K}$ is(are)
Limestone is used to remove silicate impurity.
Pig iron obtained from blast furnace contains about $4 \%$ carbon.
Coke (C) converts $\mathrm{CO}_{2}$ to $\mathrm{CO}$.
Exhaust gases consist of $\mathrm{NO}_{2}$ and $\mathrm{CO}$.
Explanation
(A) Limestone is added to remove silica as impurity.
(B) Pig iron obtained from blast furnace contains 4% carbon and many other impurities (eg. S, P, Si, Mn) in small amount.
(C) Coke (C) converts $\mathrm{CO}_2$ in $\mathrm{CO}$.
$$ \mathrm{C}+\mathrm{CO}_2 \rightarrow 2 \mathrm{CO} $$
(D) Exhaust gases consist of $\mathrm{CO}$ and $\mathrm{CO}_2$.
Hence, (A, B, C) are correct.
(B) Pig iron obtained from blast furnace contains 4% carbon and many other impurities (eg. S, P, Si, Mn) in small amount.
(C) Coke (C) converts $\mathrm{CO}_2$ in $\mathrm{CO}$.
$$ \mathrm{C}+\mathrm{CO}_2 \rightarrow 2 \mathrm{CO} $$
(D) Exhaust gases consist of $\mathrm{CO}$ and $\mathrm{CO}_2$.
Hence, (A, B, C) are correct.
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