Gas Balloons are generally filled with which Gas?

Options :
  1. Helium
  2. Oxygen
  3. Nitrogen
  4. Argon
Answer and Explanation :-

Answer: Option 1


Gas Balloons generally stay afloat in air, hence it has to be filled with a gas lighter than air. Oxygen, Nitrogen and Argon are all heavier than air. Helium is lighter than air but Hydrogen is even lighter. But since Hydrogen is highly inflammable, hence Helium, known as a 'noble gas' is used instead.

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