Question

Extraction of zinc from zinc blende is achieved by:

• A. electrolytic reduction
• B. roasting followed by reduction with carbon
• C. roasting followed by reduction with another metal
• D. roasting followed by self-reduction

Answer 1

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 $C{O}_2$ or else carbon dioxide may oxidize metallic zinc back to $ZnO$.