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Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25°C. For this process, the correct statement is -

1. The adsorption requires activation at 25°C.
2. The adsorption is accompanied by a decrease in enthalpy.
3. The adsorption increases with increase of temperature.
4. The adsorption is irreversible.

Correct answer: The adsorption is accompanied by a decrease in enthalpy.

Solution

Adsorption is an exothermic process, meaning it releases heat and decreases the system's enthalpy. This is because the adsorbate molecules lose energy as they adhere to the surface of the adsorbent.

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