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

The correct option is B Calcium oxideFlux is the substance that is added to the ore to remove the impurities (gangue) by reacting with it. Silica (SiO2) is acidic in nature. So to remove acidic impurity flux added should be basic. In the given options, only calcium oxide (CaO) is basic.

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.