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Question

Among the reactions (a) – (d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are:

(a) CaO+SiO2CaSiO3

(b) 3Fe2O3+CO2Fe3O4+CO2

(c) FeO+SiO2FeSiO3

(d) FeOFe+(1/2)O2


A

(a)

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B

(d)

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C

(c) and (d)

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D

(a) and (d)

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Solution

The correct option is C

(c) and (d)


The explanation for correct option:

C (c) and (d)

  • In the extraction of iron, Iron oxide FeO does not react with silica SiO2 hence, option (c) is incorrect for the process.
  • As represented in option (d), Iron oxide FeO does not disassociate to form iron and oxygen in the process of extraction of iron.

Explanation for incorrect options:

A (a)

  • In the extraction of iron, Calcium oxide CaO is obtained by thermal decomposition of Calcium carbonate CaCO3 react with silica (sand) impurities in hematite to form slag which is Calcium silicate CaSiO3.

B (d)

  • As represented, Iron oxide FeO does not disassociate to form iron and oxygen in the extraction of iron.

D (a) and (d)

  • In extraction of iron, Calcium oxide CaO obtained by thermal decomposition of Calcium carbonate CaCO3 react with silica (sand) impurities in haematite to form slag which is Calcium silicate CaSiO3.
  • Hence, option (a) is correct.
  • But, Iron oxide FeO does not disassociate to form iron and oxygen in the extraction of iron.
  • Hence, option (d) is incorrect.

Hence option (c) is correct, statements (c) and (d) are not correct for the extraction of iron.


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