Question

11. Which gas is used to fill balloons?

• A. Helium
• B. Carbon
• C. Hydrogen
• D. None of these

Answer 1

The correct option is A

Helium

Explanation for the correct option:

a) Helium is used to fill balloons.

• It is an inert gas as it does not react with other substances.
• It is non-flammable.
• It is a lightweight gas and possesses low density.

Explanation for the incorrect options:
b) Carbon can't be used to fill balloons because it is denser than helium.
c) Hydrogen is lighter than Helium. But due to its combustible nature, it can't be used to fill balloons.

Therefore, option A is correct.