The ease of liquefaction of noble gases decreases in the order :

H e > N e > A r > K r > X e

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X e > K r > A r > N e > H e

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K r > X e > H e > A r > N e

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A r > K r > X e > H e > N e

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Solution

The correct option is B $X e > K r > A r > N e > H e$
The ease of liquefaction decreases with decrease in critical temperature.

$H e$ has the lowest critical temperature ( $5.1 K$ ) while $R n$ has the highest critical temperature ( $373.5 K$ ). It increases as we move down the group from helium to radon.

The decrease of the critical temperature follows the trend $X e > K r > A r > N e > H e$ and hence, the same trend is followed for liquefaction.

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