Question

Which of the following is a method of preparation of $C{O}_2$?

• A. By complete combustion of carbon
• B. By action of dilute mineral acids on carbonates.
• C. As a by-product from the manufacture of Hydrogen for making ammonia.
• D. None of these

Answer 1

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

The correct options are
A

By complete combustion of carbon

B

By action of dilute mineral acids on carbonates.

C

As a by-product from the manufacture of Hydrogen for making ammonia.

1. For this question, we have to take a look at the preparation methods of
$C{O}_2$.

By complete combustion of carbon and carbon containing fuels in excess of air.

$C_{\left(s\right)}+O_{2\left(g\right)}\to C{O}_{2\left(g\right)}$

$C{H}_{4\left(g\right)}$ + O${}_{2\left(g\right)}$$\to$CO${}_{2\left(g\right)}$ + 2H${}_2$O${}_{\left(l\right)}$

2. In laboratory, CO${}_2$ is prepared by the action of dilute mineral acids on carbonates and bicarbonates.

CaCO${}_3$ + 2HCl $\to$ CaCl${}_2$ + CO${}_2$ $\uparrow$ + H${}_2$O

NaHCO${}_3$ + HCl $\to$ NaCl + CO${}_2$ $\uparrow$ + H${}_2$O

3. The main industrial source is as a by-product from the manufacture of hydrogen for making ammonia.

CO${}_{\left(g\right)}$ + H${}_2$O$\to$CO${}_{2\left(g\right)}$ + H${}_{2\left(g\right)}$

CH${}_{4\left(g\right)}$ + 2H${}_2$O$\to$CO${}_{2\left(g\right)}$ + 4H${}_{2\left(g\right)}$

4. It is also formed during fermentation process in breweries. .

$\underset{GlucoseorFructose}{C_6{H}_{12}{O}_6}\underset{AnaerobicConditions}{\overset{Yeastunder}{\to }}\underset{Etghylalcohol}{2C_2{H}_{5}OH+2C{O}_2}$

5. By heating carbonates and bicarbonates of less electropositive metals:

ZnCO${}_3$ $\to$ Na${}_2$CO${}_3$ + H${}_2$O + CO${}_2$$\uparrow$

So, (a), (b) and (c) are correct.