Q. In the dewar’s method of separation of noble gases, the mixture of noble gases is kept in contact with coconut charcoal at 173 k . Which one of the following gaseous mixtures is not adsorbed on to the charcoal?

A) Ar, Kr
B) Xe, Ar
C) He, Ne
D) Xe, Kr
Explanation

(c)
Only He and Ne are remained unadsorbed on the coconut charcoal at -100${^\circ}$c (173K) as their boiling points are less than -100${^\circ}$c .(He=4K, Ne=27K).

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.