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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 required activation at `25^(@)C`

B

The adsorption is accompanied by a decreases in enthalpy

C

The adsorption increases with increase of temperature

D

The adsorption is irreversible

Text Solution

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The correct Answer is:
B
As the adsorption of methylene blue over activated characoal is physisorption (Reference: NCERT), it is accompanied by decrease in enthalpy.
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