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Q.

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
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