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Which one of the following characteristics is associated with adsorption?

1. ΔG is negative but ΔH and ΔS are positive
2. ΔG, ΔH and ΔS all are negative
3. ΔG and ΔH are negative but ΔS is positive
4. ΔG and ΔS are negative but ΔH is positive

Correct answer: ΔG, ΔH and ΔS all are negative

Solution

Adsorption is a spontaneous process, so ΔG is negative. It is exothermic, making ΔH negative, and randomness decreases at the surface, so ΔS is also negative.

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