Which gas is commonly used in balloons to make them float?
A
Helium
B
Nitrogen
C
Oxygen
D
Hydrogen
Correct Answer: Option A — Helium
Explanation:
Helium is used in balloons because it is lighter than air and non-flammable, unlike hydrogen which poses fire risks. Helium is an inert noble gas widely used in party balloons, airships, and scientific research applications.