Roasting It is the process in which sulphide ores of the metals are converted
into oxides by heating them in the presence of excess air.
For example, zinc sulphide is converted into zinc oxide by roasting.
Calcination It is the process in which carbonate ores of
the metals are decomposed into oxides by heating them in the absence or limited
For example, zinc carbonate is decomposed into zinc oxide
and carbon dioxide by calcination. (2)
Out of roasting and calcination, only roasting is used for
sulphide ores. This is because it is easier to obtain metal from its oxide as
compared to its sulphide.
(c) Anode - Impure copper
Cathode - Strip of pure copper
Electrolyte - Acidified copper sulphate solution.
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