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JEE Advanced2022ChemistryGeneral Principles and Processes of Isolation of MetalsActual

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)

Options

  1. ALimestone is used to remove silicate impurity.
  2. BPig iron obtained from blast furnace contains about 4 % carbon.
  3. CCoke C converts CO 2 to CO .
  4. DExhaust gases consist of NO 2 and CO .

Correct answer

A. Limestone is used to remove silicate impurity.

Step-by-step solution

(A) Limestone is added to remove silica as impurity. CaO   +   SiO 2   →   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 +

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