Question

Which of the following can be used to obtain carbon dioxide?

• A. Methane
• B. Calcium carbonate
• C. Carbon monoxide
• D. Glucose

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A Methane
B Calcium carbonate
C Carbon monoxide
D Glucose

Carbon dioxide $\left(C{O}_2\right)$ gas can be obtained from all of the above as shown below -

• $C{O}_2$ is prepared in industries from $C{H}_4$ and $CO$ as shown below.

${\mathrm{CH}}_4\left(g\right)+2H_{2}O\left(g\right)\stackrel{\Delta }{\to }{\mathrm{CO}}_2\left(g\right)+4H_2\left(g\right)\mathrm{Methane}\mathrm{Water}\mathrm{Carbon}\mathrm{Hydrogen}\mathrm{dioxide}\mathrm{CO}\left(g\right)+H_{2}O\left(g\right)\stackrel{\Delta }{\to }{\mathrm{CO}}_2\left(g\right)+H_2\left(g\right)\mathrm{Carbon}\mathrm{Water}\mathrm{Carbon}\mathrm{Hydrogen}\mathrm{monoxide}\mathrm{dioxide}$

• $CaC{O}_3$ is used in the preparation of $C{O}_2$ commercially as shown below.

${\mathrm{CaCO}}_3\left(s\right)\stackrel{\Delta }{\to }\mathrm{CaO}\left(\mathrm{aq}\right)+{\mathrm{CO}}_2\left(g\right)\mathrm{Calcium}\mathrm{Calcium}\mathrm{Carbon}\mathrm{carbonate}\mathrm{oxide}\mathrm{dioxide}$

• $CaC{O}_3$ is also used to produce $C{O}_2$ in laboratories as shown below.

${\mathrm{CaCO}}_3\left(s\right)+2\mathrm{HCl}\left(\mathrm{aq}\right)\to {\mathrm{CaCl}}_2\left(\mathrm{aq}\right)+{\mathrm{CO}}_2\left(g\right)+H_{2}O\left(l\right)\mathrm{Calcium}\mathrm{Hydrochloric}\mathrm{Calcium}\mathrm{Carbon}\mathrm{Water}\mathrm{carbonate}\mathrm{acid}\mathrm{chloride}\mathrm{dioxide}$

• Fermentation is the conversion of sugar molecules into alcohol, in the absence of oxygen by yeast. During this process, $C{O}_2$ is released.

$C_6{H}_{12}{O}_6\left(\mathrm{aq}\right)\underset{\mathrm{yeast}}{\overset{\mathrm{anaerobic}\mathrm{condition}}{\to }}2C_2{H}_5\mathrm{OH}\left(\mathrm{aq}\right)+2{\mathrm{CO}}_2\left(g\right)\mathrm{Glucose}\mathrm{Ethanol}\mathrm{Carbon}\left(\mathrm{sugar}\right)\left(\mathrm{alcohol}\right)\mathrm{dioxide}$