Which of the following processes of adso...

Which of the following processes of adsorption is endothermic?

A

Adsorption of acetic acid is solution by charcoal.

B

Adsorption of oxalic acid in solution by charcoal.

C

Adsorption of hydrogen on glass.

D

Adsorption of `CO` on tungsten.

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The correct Answer is:

C

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