NTA Abhyas JEE Main2020ChemistrySurface ChemistryPractice

Which of the following is less than zero during adsorption?

Options

AΔG
BΔS
CΔH
DΔH and ΔS

Correct answer

D. ΔH and ΔS

Step-by-step solution

Adsorption is process where randomness decreases and energy is released. Hence, ΔS will be negative (as randomness is decreasing) and ΔH will also be negative ( ΔH is negative for exothermic processes). Depending on the values of Entropy and enthalpy, the Gibbs energy can either be negative or positive.

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