Which one of the following statement regarding helium is incorrect?

It is used to produce and sustain powerful superconducting magnets

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

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

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It is used in gas-cooled nuclear reactors

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Solution

The correct option is C It is used to fill gas balloons instead of hydrogen because it is lighter and non-inflammable
$H e$ gas is heavier than $H_{2}$ gas. $H e$ gas is used instead of $H_{2}$ gas because $H_{2}$ is inflammable gas whereas $H e$ is non-inflammable gas.

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