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Question

Which of the following is not a basic flux?

A
CaCO3
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B
Ca(OH)2
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C
SiO2
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D
CaO
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Solution

The correct option is C SiO2
Flux is a substance that is added to the ore to remove impurities (gangue) from it. It reacts with gangue to form slag.
If the gangue is a acidic substance, basic substance is used as flux and vice versa.
In the above options only SiO2 is an acidic flux whereas, remaining are basic flux.

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