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  4. Helium-oxygen mixture is used by deep sea divers in preference to nitrogen-oxygen mixture because

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Q. Helium-oxygen mixture is used by deep sea divers in preference to nitrogen-oxygen mixture because

CMC MedicalCMC Medical 2007

Solution:

$ He\text{-}{{O}_{2}} $ (80% : 20%) mixture is used by deep sea divers for artificial respiration. Because of low intermolecular forces in He, it is much less soluble in aqueous solutions (as compared to $ {{N}_{2}} $ ) such as blood and does not cause caiseion sickness or bends by bubbling out of blood when the worker moves from high pressure (while in deep sea) to atmospheric pressure.