Question

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

• A. incombustible
• B. lighter than hydrogen
• C. radioactive
• D. more abundant than hydrogen

Answer 1

Answer: (A)

incombustible

Answer 2

Helium (He) is a non-flammable (incombustible) gas and its lifting power is $93 \%$ as compared to flammable hydrogen gas, due to these reasons it is used in filling balloons and other lighter air-crafts.