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Q.

The noble gas which behaves abnormally in liquid state is

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a

Xe

b

Ne

c

He

d

Ar

answer is C.

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Detailed Solution

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Gaseous He on cooling below 4.18K changes to liquid known as He(I) which on cooling to 2.2 K and 1 atmospheric pressure changes to an abnormal liquid known as He(II). He(II) liquid behaves as a gas and hence this state of liquid is said to be fourth state of matter. He(II) behaves as superfluid and hence abnormal state. He(I) is a normal liquid.

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