Which one of the following statement regarding helium is incorrect

Which one of the following statement regarding helium is incorrect

A
It is used to produce and sustain powerful superconducting magnets
B
It is used as a cryogenic agent for carrying out experiments at low temperatures
C
It is used to fill gas balloons instead of hydrogen because it is lighter and non-inflammable
D
It is used in gas-cooled nuclear reactors

Solution:

Helium is heavier than hydrogen although it is non-inflammable

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