Methylene blue,from its aqueous solution,is adsorbed on activated charcoal at $25 \ ^{\circ}C$. For this process,the correct statement is
- AThe adsorption requires activation at $25 \ ^{\circ}C$.
- BThe adsorption is accompanied by a decrease in enthalpy.
- CThe adsorption increases with increase of temperature.
- DThe adsorption is irreversible.
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