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During adsorption, enthalpy and entropy of the system are but \( \Delta G \) must be

1. negative, positive
2. negative, negative
3. positive, negative
4. positive, positive

Correct answer: negative, negative

Solution

Adsorption is typically exothermic, so enthalpy decreases (negative ΔH). It also reduces randomness at the surface, so entropy decreases (negative ΔS); for the process to occur spontaneously, ΔG must be negative.

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