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

BITSAT 2020

Exam: BITSAT
Year: 2020
Subject: Chemistry
Chapter: Surface Chemistry

BITSAT 2020 · Chemistry · Surface Chemistry

Methylene blue, from its aqueous solution, is adsorbed on activated...

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?

Options

AThe adsorption requires activation at $25^{{}^{\circ}} \mathrm{C}$
BThe adsorption is accompanied by a decrease in enthalpy
CThe adsorption increases with increase of temperature
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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