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BITSAT Chemistry Surface Chemistry 2020 BITSAT 2020

BITSAT Chemistry Question (2020) — Solution

Question

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

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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