1.

Which one of the following statements regarding helium is incorrect?A. It is used to fill gas balloons instead of hydrogen because it is lighter and non-inflammableB. It is used in gas-cooled nuclear reactorsC. It is used to produce and sustain powerful surperconducting magnetsD. It is used as a cryogenic agent for carrying out experiments at low temperatures.

Answer» Correct Answer - A
Helium is not lighter than hydrogen.


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