A) \[Ne\] and \[Xe\]
B) \[He\] and \[Xe\]
C) \[Ar\] and \[Kr\]
D) \[He\] and \[Ne\]
Correct Answer: D
Solution :
When the mixture of noble gas is cooled in a coconut bulb at \[173K\]then \[Ar\], \[Kr\] and \[Xe\] are adsorbed on charcoal while He and Ne are not adsorbed.
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