Question

During the adsorption of Krypton on activated charcoal at low temperature, which of the following is true?

• A. $\Delta H<0and\Delta S<0$
• B. $\Delta H>0and\Delta S<0$
• C. $\Delta H>0and\Delta S>0$
• D. $\Delta H<0and\Delta S>0$

Answer 1

The correct option is A $\Delta H<0and\Delta S<0$

As we just saw in the previous question and also in the video, adsorption is an exothermic process and is accompanied by a reduction in the entropy of the system.
So, this means $\Delta H<0$, since it is exothermic and $\Delta S<0$, since there is reduction in the entropy of the system.