Sarthaks Test
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Which of the following reactions occur during calcination?

(i) CaCO3 → CaO + CO2

(ii) 2FeS2 +11/2 O2 → Fe2O3 + 4SO2

(iii) Al2O3.x H2O → Al2O3 + x H2O

(iv) ZnS +3/2O2 → ZnO + SO2

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(i), (iii)

(i) CaCO→ CaO + CO 

(iii) Al2O3.x H2O → Al2O3 + x H2O

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