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  • Which of the following reactions occur during calcination ?

Which of the following reactions occur during calcination?

(i) \text {CaCO}_{3}\rightarrow \text {CaO}+ \text {CO}_{2}

(ii) \text {2FeS}_{2}+\frac{11}{2}\text {O}_{2}\rightarrow \text {Fe}_{2}\text {O}_{3}+ \text {4SO}_{2}

(iii) \text {Al}_{2}\text {O}_{3}.x\text {H}_{2}\text {O}\rightarrow \text {Al}_{2}\text {O}_{3}+ x \text {H}_{2}\text {O}

(iv) \text {ZnS}+\frac{3}{\text {2}}O_{2}\rightarrow \text {ZnO}+\text {SO}_{2}

Answers (1)

The answer is the option (i, iii). In the process of calcination, heating of the ore below its melting in limited supply of air takes place. Ores that contain oxygen like oxide, hydroxides or carbonates are calcined. The reaction that takes place is:

\text {CaCO}_{3}\overset{\Delta }{\rightarrow}\text {CaO}+\text {CO}_{2}

\text {Al}_{2}\text {O}_{3}.\text {xH}_{2}\text {O}\overset{\Delta }{\rightarrow}\text {Al}_{2}\text {O}_{3}+ \text {xH}_{2}\text {O}

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