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a
O2 is adsorbed on charcoal
b
Moisture is absorbed on charcoal
c
Pre adsorbed material is desorbed
d
Charcoal is covered with inert gas
answer is C.
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Detailed Solution
Activation is a process of a heating an adsorbent in vacuum(10-8 to 10-9bar)at 573K-1073K to remove the pre adsorbed impurities.Ultra clean surface of adsorbentcan be obtained