The process that involves the removal of sulphur

Question:

The process that involves the removal of sulphur from the ores is:

1. Smelting

2. Roasting

3. Leaching

4. Refining

Correct Option:

Solution:

In roasting process, metal sulphide (MS) ore are converted into metal oxide and sulphur is remove in the form of $\mathrm{SO}_{2}$ gas.

$2 \mathrm{MS}+3 \mathrm{O}_{2} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{MO}+2 \mathrm{SO}_{2} \uparrow$