Methylene blue,from its aqueous solution,is adsorbed on activated charcoal at $25 \ ^{\circ}C$. For this process,the correct statement is

  • A
    The adsorption requires activation at $25 \ ^{\circ}C$.
  • B
    The adsorption is accompanied by a decrease in enthalpy.
  • C
    The adsorption increases with increase of temperature.
  • D
    The adsorption is irreversible.

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