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Q.

Which of the following reactions occur during calcination?

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a

CaCO3 → CaO + CO2

b

2Al(OH)3⟶Al2O3+3H2O

c

4FeS2+11O2⟶2Fe2O3+8SO2

d

Cu2S+2CuO⟶4Cu+SO2

answer is L.

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Detailed Solution

Reactions (1) and (2) represent calcination process, whereas (3) is roasting as reduction is done by heating in presence of O2 and (4) is auto-reduction process.
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