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Question:

The reaction that does not define calcination is:
CaCO3·MgCO3 → CaO + MgO + 2CO2
Fe2O3·xH2O → Fe2O3 + xH2O
2Cu2S + 3O2 → 2Cu2O + 2SO2
ZnCO3 → ZnO + CO2

ZnCO3 → ZnO + CO2

2Cu2S + 3O2 → 2Cu2O + 2SO2

Fe2O3·xH2O → Fe2O3 + xH2O

CaCO3·MgCO3 → CaO + MgO + 2CO2

Solution:

Calcination in carried out for carbonates and oxide ores in absence of oxygen. Roasting is carried out mainly for sulphide ores in presence of excess of oxygen.