Which one of the following statements regarding helium is incorrect...

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Which one of the following statements regarding helium is incorrect
(1) It is used to produce and sustain powerful superconducting magnets
(2) It is used as a cryogenic agent for carrying out experiments at low temperatures
\( \mathrm{P} \)
(3) It is used to fill gas balloons instead of hydrogen because it is lighter then hydrogen and non-inflammable
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(4) It is used in gas-cooled nuclear reactors
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