Which of the following reactions occur

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Question:
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

Solution:

Option (i) and (iii) are the answers.

Which of the following reactions occur

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