The order of liquefaction of noble gases is:

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(B) The ease of liquefaction of gases is directly proportional to their critical temperature $(T_c)$.As we move down the group from $He$ to $Rn$,the a

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$Xe > Kr > Ar > Ne > He$

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(B) The ease of liquefaction of gases is directly proportional to their critical temperature $(T_c)$.As we move down the group from $He$ to $Rn$,the atomic size increases,leading to stronger van der Waals forces of attraction,which results in a higher critical temperature.The critical temperatures of noble gases are: $He$ $(5.1 \ K)$,$Ne$ $(44.4 \ K)$,$Ar$ $(150.7 \ K)$,$Kr$ $(209.4 \ K)$,and $Xe$ $(289.7 \ K)$.Therefore,the order of ease of liquefaction is $Xe > Kr > Ar > Ne > He$.

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