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Question
An ______ is used to remove basic impurities; it combines with the impurities to form a fusible substance known as ______.
Fill in the Blanks
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Solution
An acidic flux is used to remove basic impurities; it combines with the impurities to form a fusible substance known as slag.
Explanation:
When the impurities in the ore are basic (such as FeO or CaO), an acidic flux like silica (SiO2) is added during smelting, which reacts with the impurities to form a fusible slag that can be easily removed from the molten metal. This slag floats on the metal's surface and helps purify the metal.
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