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Methylene blue, from its aqueous solutio...

Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at `25^(@)C` . For process, the correct statement is

A

The adsorption requires activation at `25^(@)C`

B

The adsorption is accompanied by a decrease in enthalpy

C

The adsorption increases with increase of temperature

D

The adsorption is irrvessible

Text Solution

Verified by Experts

The correct Answer is:
B
Adsorption of methylene blue on activated charcoal is physical adsorption, hence it is reversible. Physical adsorption is exothermic `(DeltaH` is `-ve`)and its extent decreases with increases of temperature.
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