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Question

converts sulphides to oxides. converts carbonates to oxides.

A
Calcination
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B
Heating
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C
Roasting
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D
Refining
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Solution

The correct option is C Roasting
Sulphide ores are converted into oxides by heating strongly in the presence of excess air. This process is known as roasting.
For example:
2ZnS(s)+3O2(g)2ZnO(s)+2SO2(g)
Carbonate ores are converted into oxides by heating strongly in the absence of air. This process is known as calcination. For example:CaCO3(s)CaO(s)+CO2(g)

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