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Assertion: In extraction of copper from ...

Assertion: In extraction of copper from chalcopyrite after roasting in supply of air ai moderate temperature, the temperature of the roasting ore is increased above the fusion temperature and then silica is added in reverberatory furnace.
Reason: In the extraction of copper from chalcopyrites during smelting, the impurity of iron is removed as fusible slag `(FeSIO_(3))` in blast furnace or reverberatory furnace.

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Statement-1:Silica is added as a flux in reverberatory furnace, in the extraction of copper from copper pyrites. Statement-2:Silica acts as basic flux.

Assertion: Silica is added as a flux in reverberatory furnace, in the extrcation of copper from copper phyrites. Reason: Silica decreases the melting point of the ore and increases the conductivity.

Select and write the most appropriate answer from the given alternatives for each sub-question: Silica is added to roasted copper ore during smelting process to remove :