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Question

The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of slag.


A

2Cs+O22CO2g

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B

CaCO3sCaOs+CO2g

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C

CaOs+SiO2sCaSiO3s

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Solution

The correct option is C

CaOs+SiO2sCaSiO3s


The explanation for the correct option:

(C) CaOs+SiO2sCaSiO3s

  • Slag is a by-product that is separated from metal during smelting.
  • During the preparation of impure iron, slag is obtained by the reaction of lime with silica.
  • CaSiO3 is the main component of slag.

Hence option (C) is correct.

The explanation for incorrect options:

(A) 2Cs+O2CO2g

  • Carbon from coke reacts with hot air to give carbon dioxide, which further reacts with additional coke to give carbon monoxide.
  • Highly exothermic reaction.

(B) CaCO3sCaOs+CO2g

  • Decomposition of limestone CaCO3 gives lime CaO andCO2, around 1270K in the blast furnace.

Hence, the correct option is (C).


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