JEE Advanced 2022 · Paper 2 · Chemistry Q12

ChemistryMultiple correct+4 / -2Question 48 of 54

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)

Limestone is used to remove silicate impurity.

Pig iron obtained from blast furnace contains about 4% carbon.

Coke (C) converts

\ce{CO2}

to CO.

Exhaust gases consist of

\ce{NO2}

and CO.

Answer and worked solution

Official answer: A, B, C

Check each option.

(A) Limestone decomposes to CaO, which removes silica as slag: $\ce{CaO + SiO2 -> CaSiO3}$ . True.
(B) Pig iron from the blast furnace contains about 4% carbon. True.
(C) Coke reduces $\ce{CO2}$ to the reducing gas CO: $\ce{CO2 + C -> 2CO}$ . True.
(D) The exhaust gases are mainly CO, $\ce{CO2}$ and $\ce{N2}$ , not $\ce{NO2}$ . False.

(A), (B), (C).

JEE Advanced 2022 · Paper 2, Chemistry question 12