CMC Medical CMC-Medical Ludhiana Solved Paper-2007

  • question_answer
    Helium-oxygen mixture is used by deep sea divers in preference to nitrogen-oxygen mixture because

    A)  helium is much less soluble in blood than nitrogen

    B)  nitrogen is much less soluble in blood than helium

    C)  due to high pressure deep under the sea nitrogen and oxygen react to give poisonous nitric oxide

    D)  nitrogen is highly soluble in water

    Correct Answer: A

    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.


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