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In the metallurgy of Zn the Zn dust obtained from roasting and reduction of zinc sulphide contains some ZnO. It is removed by :

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Absorbance of ultraviolet light-and reemission of white light

Shock cooling by contact with a shower of molten lead

X-ray method

Smelting.

answer is D.

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Detailed Solution

Usually, smelting helps in the easy formation of Zn dust, since zinc has one unique nature, it can absorb water also easily and form hydrate.

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