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Q.

The ease of liquefaction of noble gases decreases in the order

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a

He > Ne > Ar > Kr > Xe

b

Xe > Kr > Ar > Ne > He

c

Kr > Xe > He > Ar > Ne

d

Ar > Kr > Xe > He > Ne

answer is B.

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Detailed Solution

  • Critical Temperature: The temperature at which a substance can becomes liquid is called its Critical Temperature . Critical Temperature is directly proportional to liquefaction. 
  • As the Critical Temperature is high liquefaction is high. Critical Temperature increases down the group in the noble gases. 
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