When helium is allowed to expand into vacuum , heating effect is observed . Its reason is that:

Helium is an ideal gas

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Helium is an inert gas

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The inversion temperature of helium is very low

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The boiling point of helium is the lowest among the elements

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Solution

The correct option is C The inversion temperature of helium is very low
When helium is allowed to expand into the vacuum , the heating effect is observed because the Inversion temperature of Helium is very low.

Hence, Option "C" is the correct answer.

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