Which of the following is an acidic flux?

C a O

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M g O

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S i O_{2}

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All of these

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Solution

The correct option is C $S i O_{2}$
$S i O_{2}$ is an acidic oxide and used as an acidic flux to remove basic impurities in the form of slag

$F e O + S i O_{2} ⟶ F e S i O_{3} S l a g$
$S i O_{2}$ is used in the extraction of $C u$ to remove $F e O$

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