Question

differentiate between calcination and roasting and explain with the help of a chemical reaction the extraction of zinc from its ore

Answer 1

Dear student,

(a) The differences between roasting and calcination are given below:

Roasting	Calcination
Heating in the presence of air	Heating in the absence of air
Sulfide ores are roasted	Carbonate ores are calcined
Sulfur dioxide is released	Carbon dioxide is released
reaction showing roasting process heat 2ZnS + 3O2 --------> 2ZnO + 2SO2↑	reaction showing calcination process heat CaCO3---------> CaO +CO2↑
Not used for dehydrating an ore	Can be used to drive out moisture from an ore

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