The volume of $C O_{2}$ obtained by the complete decomposition of 9.8 g $N a_{2} C O_{3}$ at $S T P$ is :

0

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11.2

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2.06

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4.5

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Solution

The correct option is A $0$ L
The chemical formula of sodium carbonate (washing soda) is $N a_{2} C O_{3}$ . When it is heated it undergoes a thermal decomposition reaction. This takes place above 500 degree C. The reaction of decomposition is

$N a_{2} C O_{3} (s) \to N a_{2} O (s) + C O_{2} (g)$

The name of the first reaction product $N a_{2} O$ is Sodium Oxide which is solid and used in glass making and the name of the second reaction product is Carbon Dioxide which is a gas.

On calculating this reaction one might get answer 2.06 litres but as $N a_{2} C O_{3}$ is soda ash and it does not decomposes at STP And $C O_{2}$ does not evolved.

So the answer will be zero litre.

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The volume of CO2 obtained by the complete decomposition of 9.8 g Na2CO3 at STP is :

The volume of $C O_{2}$ obtained by the complete decomposition of 9.8 g $N a_{2} C O_{3}$ at $S T P$ is :