Q.

During smelting, an additional substance is added which combines with impurities to form a fusible mass. The additional substance is called

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a

Flux

b

Slag

c

Gangue

d

Ore

answer is A.

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Detailed Solution

Gangue is the waste rock or materials which carries simply rocky impurities. Flux is any substance introduced during the smelting of ores to promote its fluidity or to remove certain impurities.
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During smelting, an additional substance is added which combines with impurities to form a fusible mass. The additional substance is called