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Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25^ C . For this process, which ofthe following statement is correct?

Options

  1. AThe adsorption requires activation at 25^ C
  2. BThe adsorption is accompanied by a decrease in enthalpy
  3. CThe adsorption increases with increase of temperature
  4. DThe adsorption is irreversible

Correct answer

B. The adsorption is accompanied by a decrease in enthalpy

Step-by-step solution

The adsorption of methylene blue on activated charcoal is an example of physiosorption which is exothermic, multilayer and does not have energy barrier.

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