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a
Adsorption of H2 on Ni at high temperature
b
Adsorption of H2 on charcoal
c
Adsorption of moisture on silica gel
d
Dehydration by using anhydrous CaCl2
answer is A.
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Detailed Solution
A) At low temperature hydrogen molecules get physically adsorbed on Nickel surfaceB) At high temperature H-H bonds are broken and H-atoms are chemically absorbed on Nickel surface