Chemistry · The second law of thermodynamics: Spontaneity of processes, Delta S of the universe and Delta G of the system as criteria for spontaneity
During adsorption, enthalpy and entropy of the system are but must be
During adsorption, enthalpy and entropy of the system are but \( \Delta G \) must be
- A. negative, positive
- B. negative, negative
- C. positive, negative
- D. positive, positive
Step-by-step solution
Adsorption is an exothermic process, so enthalpy change (ΔH) is negative. The randomness of molecules decreases as they are adsorbed onto a surface, leading to a decrease in entropy (ΔS negative). For a spontaneous process, ΔG must be negative, which is achieved at low temperatures as ΔG = ΔH - TΔS (with ΔS negative, -TΔS positive, but overall negative).
Related MCQs
- Amount of usable energy available for work at uniform temperature and pressure is…
- For the reaction, \longrightarrow \) \) Hence is…
- For a given reaction, \rightleftharpoons \) a t 0^{\circ} C \) and 1 bar, which of the following is true?…
- For the reaction at } \longrightarrow \) } \) and The reaction would be:…
- Fill in the blanks by putting appropriate choices.During adsorption there is -in enthalpy and in the entropy of a system but adsorption is a…