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JEE Advanced2022Paper 2CHEM-II
Q.

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)

  1. A

    Limestone is used to remove silicate impurity.

  2. B

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

  3. C

    Coke (C) converts CO to CO.

  4. D

    Exhaust gases consist of NO and CO.

Solution

(A) Limestone (CaCO) decomposes to CaO, which combines with silica (SiO) to form CaSiO slag. Correct.

(B) Pig iron contains roughly 4% carbon along with small amounts of S, P, Si, Mn. Correct.

(C) In the hotter zone of the furnace the Boudouard reaction C + CO 2 CO occurs, regenerating the reducing agent. Correct.

(D) The exhaust gases consist of CO and CO (mainly), not NO. Incorrect.

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

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