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Q.

Which one of the following is incorrect about helium ?

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a

it is used in gas-cooled nuclear reactors

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 to fill gas balloons instead hydrogen because it is lighter and non-inflammable 

answer is D.

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Detailed Solution

Helium is a light gas, lighter in comparison to air which is mostly nitrogen and oxygen and it is non-inflammable in nature, and hence it is used to fill air-balloons. But helium is not lighter than hydrogen gas as its atomic weight is 4 while the molecular weight of hydrogen is 2.

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