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).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.