JEE Main & Advanced Chemistry The s-Block Elements Question Bank Critical Thinking

  • question_answer Which of the following gas mixture is used by the divers inside the sea [AFMC 2004]

    A) \[{{O}_{2}}+He\]

    B) \[{{O}_{2}}+Xe\]

    C) \[{{O}_{2}}+Ar\]

    D) \[{{O}_{2}}+{{N}_{2}}\]

    Correct Answer: A

    Solution :

    Helium is not soluble in blood even under high pressure, a mixture of 80% helium and 20% oxygen is used instead of ordinary air by sea  divers for respiration.

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