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  5. The p-Block Elements-I / p-ब्लॉक के कुछ तत्व-I

12th Class Chemistry The p-Block Elements-I / p-ब्लॉक के कुछ तत्व-I Question Bank MCQs - The p-Block Elements

  • question_answer
    Helium is added to oxygen used by deep sea divers because

    A) it is less soluble in blood than nitrogen under high pressure

    B) it is lighter than nitrogen

    C) it is readily miscible with oxygen

    D) it is less noisonous than nitroeen.

    Correct Answer: A

    Solution :

    Unlike nitrogen, helium is less soluble in blood even under high pressure. Hence a mixture of 80% helium and 20% oxygen is used instead of ordinary air.


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