why delta G for adsorption is negative as delta H is negative but delta S is +ve ???

Expression relating free energy change in a process is related to enthalpy change and entropy change by the expression,

ΔG = ΔH - TΔS

If change in enthalpy is negative and change in entropy is positive, the value of TΔ  S will be negative. Hence, free energy change will always be negative.

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