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Question

The amount of oxygen in the inhaled air is 21% and 0.04% of carbon dioxide.


A

10%

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B

21%

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Solution

The correct option is A

10%


The air which we breathe in and breathe out is not pure oxygen or carbon dioxide respectively. Inhaled air is a mixture of different gases present in the atmosphere. It contains around 78% nitrogen, 21% oxygen, 0.04% of carbon dioxide and other gases.


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