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Which of the following reactions occur during calcination?
(i) \( \mathrm{CaCO}_{3} \longrightarrow \mathrm{CaO}+\mathrm{CO}_{2} \)
(ii) \( 2 \mathrm{FeS}_{2}+\frac{11}{2} \mathrm{O}_{2} \longrightarrow \mathrm{Fe}_{2} \mathrm{O}_{3}+4 \mathrm{SO}_{2} \)
(iii) \( \mathrm{Al}_{2} \mathrm{O}_{3} \cdot x \mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+x \mathrm{H}_{2} \mathrm{O} \)
(iv) \( \mathrm{ZnS}+\frac{3}{2} \mathrm{O}_{2} \longrightarrow \mathrm{ZnO}+\mathrm{SO}_{2} \)
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