In the metallurgy of Zinc, flux is not used because

Zinc ore has no impurities

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Zinc is volatile than impurites and is easily separated

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Zinc reacts with flux

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flux is volatile

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Solution

The correct option is D Zinc ore has no impurities
Zinc after roasting, converts to $Z n O$ and it has no impurities. So, there is no need of adding flux to it.
Hence, Option "A" is the correct answer.

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