Question

Zinc blende is converted to zinc oxide by ______.

Options

• Calcination

• Roasting

Answer 1

Zinc blende is converted to zinc oxide by roasting.

Explanation:

Zinc blende (ZnS) is converted to zinc oxide (ZnO) by roasting, which involves heating the concentrated sulfide ore strongly in the presence of excess air. This oxidation process converts the zinc sulfide into zinc oxide and releases sulphur dioxide gas, according to the reaction:

\[\ce{2ZnS + 3O2 -> 2ZnO + 2SO2}\]