Question

Choose the correct option.

The gas produced on heating ${\mathrm{CaCO}}_3$ is ___________.

• A. $O_2$
• B. ${CO}_2$
• C. $CO$
• D. $O_3$

Answer 1

The correct option is B

${\mathrm{CO}}_2$

• Heating of ${\mathrm{CaCO}}_3$ is a decomposition reaction.
• Decomposition reaction - A reaction in which a single compound splits into two or more simple substances, called decomposition reaction.
• Decomposition of ${\mathrm{CaCO}}_3$ produces Calcium oxide $\left(\mathrm{CaO}\right)$ and carbon dioxide $\left({\mathrm{CO}}_2\right)$ .

$$\begin{gathered} {\mathrm{CaCO}}_3\left(\mathrm{s}\right)\stackrel{∆}{\to }\mathrm{CaO}\left(\mathrm{s}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right) \\ \mathrm{Calcium}\mathrm{oxide}\mathrm{Calcium}\mathrm{oxide}\mathrm{Carbon}\mathrm{dioxide} \end{gathered}$$

Therefore option (b) ${\mathrm{CO}}_2$ is correct.