Surface Chemistry - Result Question 19
####20. Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at
(2013 Adv.)
(a) the adsorption requires activation at
(b) the adsorption is accompanied by a decreases in enthalpy
(c) the adsorption increases with increase of temperature
(d) the adsorption is irreversible
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Answer:
Correct Answer: 20. (a)
Solution:
- Physical adsorption takes place with decrease in enthalpy thus exothermic change. It is physical adsorption and does not require activation. Thus,
Being physical adsorption
