In metallurgical process, the flux used for removing acidic impurities is-

silica

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sodium chloride

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limestone

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sodium carbonate

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Solution

The correct options are
C sodium carbonate
D limestone
$S i O_{2} (S i l i c a)$ is Acidic in Nature.
$N a C l$ can't act as a flux because it is a neutral salt.
$L i m e s t o n e a n d S o d i u m C a r b o n a t e$ both are basic in nature.

For removing acidic impurities, we need the flux to be basic.

Hence, Option"C" & "D" are correct answers.

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