Which of the following reactions occur during calcination? (1) CaCO3 ⟶CaO+CO2 (2) 2 Al(OH)3 ⟶Al2

step 1 So the question is asking which of the following process after during calcination. So, reaction

Which of the following reactions occur during calcination?...

Which of the following reactions occur during calcination? (1) $\mathrm{CaCO}_{3} \longrightarrow \mathrm{CaO}+\mathrm{CO}_{2}$ (2) $2 \mathrm{Al}(\mathrm{OH})_{3} \longrightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+3 \mathrm{H}_{2} \mathrm{O}$ (3) $4 \mathrm{FeS}_{2}+11 \mathrm{O}_{2} \longrightarrow 2 \mathrm{Fe}_{2} \mathrm{O}_{3}+8 \mathrm{SO}_{2}$ (4) $\mathrm{Cu}_{2} \mathrm{~S}+2 \mathrm{CuO} \longrightarrow 4 \mathrm{Cu}+\mathrm{SO}$

Which of the following reactions occur during calcination?
(1) $\mathrm{CaCO}_{3} \longrightarrow \mathrm{CaO}+\mathrm{CO}_{2}$
(2) $2 \mathrm{Al}(\mathrm{OH})_{3} \longrightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+3 \mathrm{H}_{2} \mathrm{O}$
(3) $4 \mathrm{FeS}_{2}+11 \mathrm{O}_{2} \longrightarrow 2 \mathrm{Fe}_{2} \mathrm{O}_{3}+8 \mathrm{SO}_{2}$
(4) $\mathrm{Cu}_{2} \mathrm{~S}+2 \mathrm{CuO} \longrightarrow 4 \mathrm{Cu}+\mathrm{SO}$

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Key Concepts

Dehydration of Hydroxides

Dehydration of hydroxides involves the removal of water from a hydroxide compound upon heating, resulting in the formation of an oxide. This transformation is a typical example of a calcination process, as seen in the conversion of aluminum hydroxide to alumina.

Calcination

Calcination is a thermal treatment process applied to ores and other solid materials to bring about thermal decomposition, phase transition, or removal of a volatile fraction. It usually occurs at high temperatures below the melting point and in the absence or limited supply of air or oxygen.

Thermal Decomposition

Thermal decomposition is a chemical reaction where a compound breaks down into simpler compounds or elements when heated. This is a key aspect in processes like calcination, where heat causes the breakdown of compounds such as carbonates and hydroxides.

Carbonate Decomposition

Carbonate decomposition is a type of thermal decomposition reaction where a carbonate compound, such as calcium carbonate, breaks down into an oxide and carbon dioxide gas when heated. This reaction is commonly encountered in calcination processes in the production of lime.

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