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  • Which among the following reaction occurs during calcination? <img alt="\begin{aligned} \text{A}.& \mathrm{ZnCO}_3(\mathrm{~s})+\text { heat } \rightarrow \mathrm{ZnO}(\mathrm{s})+\ma

Which among the following reaction occurs during calcination?

\begin{aligned} \text{A}.& \mathrm{ZnCO}_3(\mathrm{~s})+\text { heat } \rightarrow \mathrm{ZnO}(\mathrm{s})+\mathrm{CO}_2(\mathrm{~g}) \\ \text{B}.& \mathrm{CaCO}_3 \cdot \mathrm{MgCO}_3(\mathrm{~s})+\text { heat } \rightarrow \mathrm{CaO}(\mathrm{s})+\mathrm{MgO}(\mathrm{s})+2 \mathrm{CO}_2(\mathrm{~g}) \\ \text{C}.& \mathrm{Al}(\mathrm{OH})_3+\text { heat } \rightarrow \mathrm{Al}_2 \mathrm{O}_3+3 \mathrm{H}_2 \mathrm{O} \\ \text{D}.& 2 \mathrm{PbS}(\mathrm{s})+3 \mathrm{O}_2+\text { heat } \rightarrow 2 \mathrm{PbO}(\mathrm{s})+2 \mathrm{SO}_2(\mathrm{~g}) \end{aligned}

Option: 1

A only


Option: 2

B and C only


Option: 3

D only


Option: 4

A, B and C only


Answers (1)

best_answer

In isolation of metal, conversion of ore to oxide is done by Calcination or roasting method. In calcination, the ore is heated at high temperature in absence of air/limited supply of air. Calcination is used to convert carbonated ores into oxide ores and hydrated ores are converted to anhydrous oxide. The reaction given in option (4) represents heating of ore in presence of oxygen i.e., roasting.

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