The compound(s) that is(are) removed as slag | vedclass

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(D) During the extraction of copper from copper pyrites $(CuFeS_{2})$,the ore is roasted to remove sulfur as $SO_{2}$ and convert iron and copper into

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(D) During the extraction of copper from copper pyrites $(CuFeS_{2})$,the ore is roasted to remove sulfur as $SO_{2}$ and convert iron and copper into oxides.In the smelting process,silica $(SiO_{2})$ is added as a flux to remove the iron oxide $(FeO)$ impurity.$FeO$ reacts with $SiO_{2}$ to form iron silicate $(FeSiO_{3})$,which is removed as slag:$FeO + SiO_{2} \rightarrow FeSiO_{3}$ (slag).Therefore,only $FeO$ is removed as slag.

The compound$(s)$ that is(are) removed as slag during the extraction of copper is:
$1. CaO$
$2. FeO$
$3. Al_{2}O_{3}$
$4. ZnO$
$5. NiO$
Choose the correct answer from the options given below.

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The compound$(s)$ that is(are) removed as slag during the extraction of copper is:$1. CaO$$2. FeO$$3. Al_{2}O_{3}$$4. ZnO$$5. NiO$Choose the correct answer from the options given below.