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(B) In the blast furnace,limestone $(CaCO_3)$ is added as a flux.First,it decomposes to provide $CaO$ and $CO_2$: $CaCO_3 \rightarrow CaO + CO_2$.Then

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$I, II$

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(B) In the blast furnace,limestone $(CaCO_3)$ is added as a flux.First,it decomposes to provide $CaO$ and $CO_2$: $CaCO_3 \rightarrow CaO + CO_2$.Then,$CaO$ 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,it provides a source of $CaO$ $(I)$ and removes impurities $(II)$. The $CO_2$ produced is a byproduct,not the primary purpose of adding limestone. Therefore,the correct statements are $I$ and $II$.

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 $CO_2$