Limestone is present in the blast furnace in production of iron in order to :
$(I)$ provide a source of $C a O$
$(I I)$ remove some impurities
$(I I I)$ supply $C O_{2}$

I, I I, I I I

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I, I I

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I I, I I I

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I

only

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Solution

The correct option is A $I, I I, I I I$
(i) Decomposition of limestone forms $C a O$ .
$C a C O_{3} \to C a O + C O_{2}$
(ii) Calcium oxide reacts with silica to form slag. Thus, gangue is removed in the form of slag.
$C a O + S i O_{2} \to C a S i O_{3} (s l a g)$
(iii) Decomposition of lime supplies carbon dioxide which is useful for maintaining excess of $C O$ so that the conversion of $F e_{3} O_{4}$ to $F e_{2} O_{3}$ is prevented.

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