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 given question is a question from the topic Metallurgy. It is important to note that Zinc blende is a sulphide with the formula $ZnS$ . Therefore for the process of extraction we have to convert it into the oxide first by the process of roasting. Then in the next step we can extract the Zinc by reduction.

Complete step by step answer:
The process of extraction is carried out in 2 processes. The first process is the roasting and the second is reduction in reacting with Carbon.
Step $1$ :
Roasting is the process of burning any compound under the influence of dry oxygen. The balanced equation for the given process is:
$ZnS + {O_2} \to ZnO + S{O_2} \\\ 2ZnS + 3{O_2} \to 2ZnO + 2S{O_2} \\\$
Step $2$ :
In the second step the remaining oxide is needed to be reduced with the oxygen so that the pure Zinc can be extracted:
$ZnO + C \to Zn + CO$

Note:
Most important thing here is to write the balanced chemical equations as it is the initial and generally most careless state. This extradition process varies heavily from compound to compound even for the same element. Though it is a common way to extract sulphides, they are generally roasted to Oxides to be further reduced for extraction.