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Question

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

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Solution

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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