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Q.

Which one of the following statements regarding helium is incorrect?

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a

It is used to produce and sustain powerful superconducting magnets

b

It is used as a cryogenic agent for carrying out experiments at low temperatures

c

It is used in gas-cooled nuclear reactors

d

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

answer is C.

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Detailed Solution

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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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