In Dewar's method of separation of noble gases,the mixture of the noble gases is kept in contact with coconut charcoal at 173 K.Which one of the following gaseous mixture is not adsorbed on to the charcoal?

Options

A. Ar,Kr
B. Xe,Ar
C. He,Ne
D. Xe,Kr

Answer

c

Explanation

As the boiling points of He and Ne are less than `-100^(@)` , they both remain unadsorbed at the coconut charcoal at 173 k`(-100^(@)C)`