Q28 / 125 · BITSAT 2020 · Chemistry

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

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

Solution

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

Hence, the correct answer is option: 'B'.

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