Which of the following species is (are) desir | vedclass

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(C) In the extraction of iron from haematite $(Fe_2O_3)$,$SiO_2$ is an impurity (gangue) that must be removed by adding a flux like $CaO$ to form $CaS

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$SiO_2$

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(C) In the extraction of iron from haematite $(Fe_2O_3)$,$SiO_2$ is an impurity (gangue) that must be removed by adding a flux like $CaO$ to form $CaSiO_3$ slag. Therefore,$SiO_2$ is undesirable in iron extraction.In the extraction of copper from copper pyrites $(CuFeS_2)$,$FeO$ is formed as an impurity during roasting. $SiO_2$ is added as a flux to react with $FeO$ to form $FeSiO_3$ (slag),which is easily removed. Thus,$SiO_2$ is a desirable substance in copper extraction.

Which of the following species is (are) desirable substance$(s)$ in the extraction of copper but not in the extraction of iron?

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