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Reactions of Carbon and Carbon Dioxide

Which of the ...

Question

Which of the following is a method of preparation of $C O_{2}$ ?

A

By complete combustion of carbon

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B

By action of dilute mineral acids on carbonates.

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C

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

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D

None of these

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Solution

The correct option is D
None of these

For this question, we have to take a look at the preparation methods of
$C O_{2}$ .

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

$C_{(s)} + O_{2 (g)} \to C O_{2 (g)}$

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

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 $_{2}$ $↑$ + H $_{2}$ O

NaHCO $_{3}$ + HCl $\to$ NaCl + CO $_{2}$ $↑$ + H $_{2}$ O

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

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

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

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

$C_{6} H_{12} O_{6} G l u c o s e o r F r u c t o s e Y e a s t u n d e r - ------------ \to A n a e r o b i c C o n d i t i o n s 2 C_{2} H_{5} O H + 2 C O_{2} E t g h y l a l c o h o l$

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

ZnCO $_{3}$ $\to$ Na $_{2}$ CO $_{3}$ + H $_{2}$ O + CO $_{2}$ $↑$

So, all options are correct.

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