Question

Zinc blende is converted to oxide by ______ (roasting/calcination) process.

Answer 1

Zinc blende is converted to oxide by roasting process.

Explanation:

Zinc blende ($$\mathrm{ZnS}$$) is heated in excess air and oxidised to zinc oxide: $$2\mathrm{ZnS} + 3\mathrm{O_2} \rightarrow 2\mathrm{ZnO} + 2\mathrm{SO_2}$$.