Which of the following are the uses of ${CO}_{2}$ ?

As a fire extinguisher

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In preparation of aerated water

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In artificial respiration

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Used in the manufacture of washing soda

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Solution

The correct options are
A
As a fire extinguisher

B
In preparation of aerated water

C
In artificial respiration

D
Used in the manufacture of washing soda

1)A mixture of 95% of $O_{2}$ and 5% $C O_{2}$ is used for artificial respiration in case of victims of carbon monoxide poisoning and pneumonia patients.
2)Soda water and other aerated soft drinks are, in fact, a solution of $C O_{2}$ in water. The solution is prepared by increasing pressure since solublility of $C O_{2}$ is low in normal conditions.
3)Even $15 % C O_{2}$ in the atmosphere does not support combustion. Therefore $C O_{2}$ is used for extinguishing fire.
4)Washing soda(Sodium carbonate) is obtained by the reaction of conc. sodium chloride solution with ammonia and carbon dioxide.
$N a C l + N H_{3} + C O_{2} + H_{2} O \to N a H C O_{3} (s o d i u m h y d r o g e n c a r b o n a t e) + N H_{4} C l$
The sodium hydrogen carbonate is separated by filteration, dried and heated to form sodium carbonate. Hydrating sodium carbonate results in washing soda.
$N a H C O_{3} \to N a_{2} C O_{3} (s o d i u m c a r b o n a t e) + H_{2} O + C O_{2}$
$N a_{2} C O_{3} + 10 H_{2} O \to N a_{2} C O_{3} .10 H_{2} O (W a s h i n g S o d a)$

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