Question

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

A
He>Ne>Ar>Kr>Xe
B
Xe>Kr>Ar>Ne>He
C
Kr>Xe>He>Ar>Ne
D
Ar>Kr>Xe>He>Ne

Solution

## The correct option is B $$Xe > Kr > Ar > Ne > He$$The ease of liquefaction decreases with decrease in critical temperature. $$He$$ has the lowest critical temperature ($$5.1\ K$$) while $$Rn$$ 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 $$Xe>Kr>Ar>Ne>He$$ and hence, the same trend is followed for liquefaction.ChemistryNCERTStandard XII

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