Q.

Noble gases are adsorbed by

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a

Anhydrous calcium chloride

b

Ferric hydroxide

c

Conc. H2SO4

d

Activated coconut charcoal

answer is D.

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Detailed Solution

Noble gases are adsorbed by coconut charcoal. The adsorption of different noble gases occurs at different temperatures, hence charcoal is used to separate these gases. Helium is not adsorbed by charcoal (as it is very difficult liquefiable gas).
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