Question:
Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at $25^\circ $C. For this process, the correct statement is
Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at $25^\circ $C. For this process, the correct statement is
Updated On: Jul 28, 2022
- the adsorption requires activation at $25^\circ $C
- the adsorption is accompanied by a decreases in enthalpy
- the adsorption increases with increase of temperature
- the adsorption is irreversible
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The Correct Option is B
Solution and Explanation
Physical adsorption takes place with decrease in enthalpy thus exothermic change. It is physical adsorption and does not require activation. Thus, (a) is incorrect. Being physical adsorption $\Delta $H < 0 thus, (b) is correct. Exothermic reaction is favoured at low temperature thus (c) is incorrect. Physical adsorption is always reversible, thus (d) is incorrect.
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Concepts Used:
Adsorption
Heinrich Kayser, the German physicist was the first to coin the term adsorption. Adsorption can be explained as a surface phenomenon where particles remain attached on the top of a material. Generally, it comprises the molecules, atoms, liquid, solid in a dissolved stage, even the ions of a gas that are attached to the surface. Much to our surprise, the consequence of surface energy i.e. adsorption is present in biological, physical, chemical, and natural systems and are used in many industrial applications.
