Q.

Percentage of Nitrogen in the gaseous mixture of respiratory apparatus used by scuba divers is

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11.7%

56.2%

32.1%

4.5%

answer is B.

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Detailed Solution

Solubility of helium in blood is very much lesser than that of nitrogen.It is therefore used in the respiratory apparatus of scuba divers to prevent them from a disease called Decompression sickness.The composition of the gaseous mixture used is 56.2% of Nitrogen, 32.1% of Oxygen and 11.7% of Helium.

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