Question

Identify x, y and z for the following metallurgical process:
$\text{Metal sulphide}\stackrel{x}{\to }\text{Metal oxide}\stackrel{y}{\to }\text{Impure metal}\stackrel{z}{\to }\text{Pure metal}$

• A. roasting, smelting, electrolysis
• B. roasting, calcination, smelting
• C. calcination, auto-reduction, bassemerisation
• D. none of the above is correct

Answer 1

The correct option is A roasting, smelting, electrolysis

The conversion of metal sulphide to metal oxide involves the process of roasting, and hence 'x' is roasting, The metal oxide can then be converted to the impure metal by reduction, which means 'y' is smelting. To convert the impure metal to pure metal, the refining method used is electrolysis here, hence 'z' is electrolysis.