Question

The chalcocite is roasted and not calcined during recovery of copper. If true enter \[{\rm{1}}\] else \[0\].

Answer 1

Hint: As we know that, there are two processes by which we can extract pure metal, one is roasting and other is calcination. Roasting is used to extract pure metal from the metals which contains sulphur atoms. calcination is used to extract pure metal from the metals which contain oxygen.

Complete solution
Now we will understand what is roasting and calcination in detail.
Roasting: When ores are formed by sulphide ions then the metals are purified by roasting. So, roasting is the process to extract metals from sulphide ore by heating at higher temperature. In this process, sulphide ore first converted into metal oxide and sulphur di-oxide gas is released and then the sulphide ore is converted into pure metal by reduction.
Calcination: Calcination is the process of producing metal oxide at very high temperature. At high temperature, the impurities of volatile compounds are removed. So, this is the process to get metal oxides such as calcium carbonate when heated at higher temperature it produces calcium oxide by removing carbon dioxide.
Now we are able to answer by using the above explanation-
Chalcocite is an ore which is represented by formula \[{\rm{C}}{{\rm{u}}_{\rm{2}}}{\rm{S}}\], so as we have seen in above explanation that roasting is right process by which we can extract metal from sulphide ore.
The reaction occurs as
\[
{\rm{2C}}{{\rm{u}}_{\rm{2}}}{\rm{S}}\,{\rm{ + 3}}{{\rm{O}}_{\rm{2}}}\, \to \,{\rm{2C}}{{\rm{u}}_{\rm{2}}}{\rm{O + }}\,{\rm{S}}{{\rm{O}}_{\rm{2}}}{\rm{(g)}}\\
{\rm{2C}}{{\rm{u}}_{\rm{2}}}{\rm{O}}\,{\rm{ + }}\,{\rm{C}}{{\rm{u}}_{\rm{2}}}{\rm{S}}\, \to {\rm{6Cu}}\,{\rm{(s)}}\,{\rm{ + }}\,{\rm{S}}{{\rm{O}}_{\rm{2}}}{\rm{(g)}}
\]

Therefore, the statement is true (\[{\rm{1}}\]).

Note:
Ore is extracted from the earth surface which is also called mining and then it is purified by smelting. Every ore can be mineral but every mineral cannot be an ore.