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Question

Limestone is present in the blast furnace in production of iron in order to :
(I) provide a source of CaO
(II) remove some impurities
(III) supply CO2

A
I,II,III
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B
I,II
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C
II,III
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D
I only
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Solution

The correct option is A I,II,III
(i) Decomposition of limestone forms CaO.
CaCO3CaO+CO2
(ii) Calcium oxide reacts with silica to form slag. Thus, gangue is removed in the form of slag.
CaO+SiO2CaSiO3(slag)
(iii) Decomposition of lime supplies carbon dioxide which is useful for maintaining excess of CO so that the conversion of Fe3O4 to Fe2O3 is prevented.

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