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Which of the following does not promote physical adsorption?

1. High pressure
2. Negative enthalpy change (ΔH)
3. A higher critical temperature of the adsorbate
4. High temperature

Correct answer: High temperature

Solution

Physical adsorption is favoured by high pressure, low temperature, a high critical temperature of the adsorbate, and an exothermic (negative deltaH) process. High temperature decreases physical adsorption, so 'high temperature' is the factor that does not promote it.

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