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Which of the following reactions occur during calcination ?

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Which of the following reactions occur during calcination ?
A. `CaCO_(3) to CaO +CO_(2)`
B. `2FeS_(2)+(11)/(2)O_(2) to Fe_(2)O_(3) +4SO_(2)`
C. `Al_(2)O_(3).xH_(2)O to Al_(2)O_(3) +xH_(2)O`
D. `ZnS+(3)/(2)O_(2) to ZnO+SO_(2)`
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Correct Answer - A::C
Decompositon and dehydration occur during calcination.
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