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Which one of the following statements regarding helium is incorrect ?
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It is used to fill gas balloons instead of hydrogen because it is lighter and non-inflammable
Helium is twice as heavy as hydrogen, its lifting power is $92 \%$ of that of hydrogen. Helium has the lowest melting and boiling point of any element which makes liquid helium an ideal coolant for many extremely low temperature application such as super conducting magnet and cryogenic research where temperature close to absolute zero are needed.
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