A) It is used to fill gas balloons instead of hydrogen because it is lighter and non-inflammable
B) It is used as a cryogenic agent for carrying out experiments at low temperatures
C) It is used to produce and sustain powerful superconducting magnets
D) It is used in gas-cooled nuclear reactors
Correct Answer: C
Solution :
Helium is not used to produce and sustain powerful superconducting magnets. All others are the uses of helium.
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