Helium is used in balloons in place of hydrogen because it is

  1. A

    Radioactive 

  2. B

    More abundant than hydrogen

  3. C

    Incombustible 

  4. D

    Lighter than hydrogen 

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    Solution:

    Helium is used in balloons in place of hydrogen. Although lifting power of helium is about 92% of that of hydrogen, yet it is preferred because it is non-flammable or incombustible.

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