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(B) In the blast furnace,limestone $(CaCO_3)$ is added to the charge.First,it decomposes to form calcium oxide $(CaO)$ and carbon dioxide $(CO_2)$:$Ca

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$I, II$

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(B) In the blast furnace,limestone $(CaCO_3)$ is added to the charge.First,it decomposes to form calcium oxide $(CaO)$ and carbon dioxide $(CO_2)$:$CaCO_3 \rightarrow CaO + CO_2$Second,the calcium oxide $(CaO)$ acts as a flux to remove acidic impurities like silica $(SiO_2)$ present in the ore,forming slag $(CaSiO_3)$:$CaO + SiO_2 \rightarrow CaSiO_3$Thus,limestone provides a source of $CaO$ (statement $I$) and helps remove impurities (statement $II$). The $CO_2$ produced is a byproduct,not the primary purpose of adding limestone. Therefore,statements $I$ and $II$ are correct.

Limestone is present in the blast furnace production of iron in order to:
$(I)$ provide a source of $CaO$
$(II)$ remove some impurities
$(III)$ supply $CO_2$

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Limestone is present in the blast furnace production of iron in order to:$(I)$ provide a source of $CaO$$(II)$ remove some impurities$(III)$ supply $CO_2$