Which is not a basic flux:

Silica

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Lime stone

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Calcite

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Quick lime

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Solution

The correct option is A Silica
Flux: The substance which are added to remove the gangue from the concentrated ore in its molten state are called Flux and the substance formed with flux is called Slag.
Slags are generally silicates.
Acidic Flux
$S i O_{2} + C a O \to C a S i O_{3}$
Acidic flux removes basic impurities. Some more acidic flux are Borax, HCl, $H_{3} P O_{4}$ etc.
Basic Flux
$S i O_{2} + M g O \to M g S i O_{3}$
Basic flux removes acidic impurities, Examples of basic flux Limestone, $F e_{2} O_{3}$ , $M g C O_{3}$ , CaO, etc.

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When copper pyrites is roasted in excess of air, a mixture of CuO + FeO is formed. FeO is present as impurity. This can be removed as slag during reduction of CuO. The flux added to form slag is

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