Helium-oxygen mixture is used by deep sea divers in preference to nitrogen-oxygen mixture, because :

helium is much less soluble in blood than nitrogen

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nitrogen is much less soluble in blood than helium

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due to high pressure nitrogen reacts with oxygen to give poisonous nitric oxide

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nitrogen is highly soluble in water

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Solution

The correct option is A helium is much less soluble in blood than nitrogen
Nitrogen is soluble in blood and causes condition of bonds. Helium is much less soluble in blood. Thus, helium-oxygen mixture is used rather than nitrogen-oxygen mixture.

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H e

O_{2}

(O_{2} + H e)

(O_{2} + N_{2})

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