The noble gas which behaves abnormally in liquid state isA. `Xe`B. `Ne

1.	The noble gas which behaves abnormally in liquid state isA. `Xe`B. `Ne`C. `He`D. `Ar`
Answer» Correct Answer - C Liquid He is unique liquid as it exists in two forms, He`(I)` and He`(II)`.He`(I)` is a normal liquid with normal properties. On cooling to `2.19 k` and `38mm` pressure it changes to He `(II)` with abrupt changes in many physical properties such as density dielectric constant and specific heat. He `(II)` is super fluid or quantum mechanical liquid. it has very high heat of conductance `(600 " times of Cu ")`, low visosity `(1//10 " of " H_(2) " gas ")` and flat meniscus (a low surface tension).

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The noble gas which behaves abnormally in liquid state isA. `Xe`B. `Ne`C. `He`D. `Ar`

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