Which of the following reactions occur during calcination?
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a
CaCO3⟶CaO+CO2
b
2FeS2+112O2⟶Fe2O3+4SO2
c
Al2O3⋅xH2O⟶Al2O3+xH2O
d
ZnS+32O2⟶ZnO+SO2
answer is A.
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Detailed Solution
Calcination involves heating of the ore below its melting point in the absence of air or in limited supply of air. Oxygen containing ores like oxide, hydroxides and carbonates are calcined. Following reactions occur during calcination.CaCO3⟶ΔCaO+CO2↑Al2O3⋅xH2O⟶ΔAl2O3+xH2O