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Question

Extraction of zinc from zinc blende is achieved by:

A

electrolytic reduction

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B

roasting followed by reduction with carbon

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C

roasting followed by reduction with another metal

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D
roasting followed by self-reduction
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Solution

The correct option is B

roasting followed by reduction with carbon


Zinc blende or Black Jack - ZnS - also contains some PbS. The latter skimmed off by using pine oil during the froth floatation. Once PbS is removed,
froth floatation helps dress (or concentrate) Zinc blende. Post concentration, it is roasted to convert ZnS into ZnO. Then it is smelted with excess coke
to minimize the production of CO2 or else carbon dioxide may oxidize metallic zinc back to ZnO.

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