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Which of the following fluxes is employed to eliminate acidic impurities during a metallurgical operation?

1. Silica
2. Limestone
3. Sodium chloride
4. Sodium carbonate

Correct answer: Limestone

Solution

To remove acidic impurities a basic flux is used. Limestone (CaCO3, giving basic CaO) combines with acidic impurities to form slag. Silica is an acidic flux used to remove basic impurities.

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