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Q.

Statement I : When helium is allowed to expand into vacuum, heating effect is observed.Statement II : The inversion temperature of helium is very low.

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a

Statement I and II are correct

b

Statement I is correct  and II is incorrect

c

Statement I is incorrect and statement II is correct

d

Both statement I and II are incorrect

answer is A.

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Detailed Solution

When any gas is allowed to undergo unrestricted adiabatic expansion below inversion temperature, cooling effect is observed except in case of H2 and He. This is known as Joule Thomson effect. In case of H2 and He heating effect is observed due to their Low inversion temperature value.
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