A) The adsorption is accompanied by a decrease in enthalpy
B) The adsorption requires activation at \[25{}^\circ C\]
C) The adsorption increases with increases of temperature
D) The adsorption is irreversible
Correct Answer: A
Solution :
| [a] Adsorption is spontaneous \[(\Delta G<0)\] and takes place with decrease in entropy (due to decrease in disorder). |
| Thus, \[\Delta S<0\] |
| Since, \[\Delta G=\Delta H-T\Delta S\Rightarrow \Delta H=(\Delta G+T\Delta S)\] |
| Since, both \[\Delta G<0\], and \[\Delta S<0\] |
| Hence, \[\Delta H<0\](exothermic) |
| By Le Chatelier?s principle, increase in temperature, decreases adsorption. |
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