If silica is present as an impurity in an ore, then which of the following can be used as flux?

Water

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Calcium oxide

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Sulphur dioxide

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Carbon dioxide

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Solution

The correct option is B Calcium oxide
Flux is the substance that is added to the ore to remove the impurities (gangue) by reacting with it.
Silica $(S i O_{2})$ is acidic in nature. So to remove acidic impurity flux added should be basic. In the given options, only calcium oxide $(C a O)$ is basic.

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