1.

Explain the following `(i)` Chalcocite is roasted and not calcined during recovery of copper. `(ii)` Magnesium oxide is used for lining in steel making furnaceA. MgO acts as an acidic flux to remove impurities of Si, P and SB. MgO acts as a basic flux to remove impurities of Si P and SC. MgO acts as an oxidising agent to removing impurities of oxidesD. MgO does not react with any type of impurities

Answer» Correct Answer - B
MgO acts as a basic flux to remove impurities of Si, P and S through slag formation.
`underset("Basic flux")(MgO) + underset("Acidic impurities ")(SiO_(2)) to underset("Slag")(MgSiO_(3))`
`3MgO + P_(2)O_(5) to Mg_(3) (PO_(4))_(2)`
`MgO + SO_(2) to MgSO_(3)`


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