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Which of the following processes does NOT occur at the interface of two phases?

1. crystallisation
2. heterogeneous catalysis
3. homogeneous catalysis
4. corrosion

Correct answer: homogeneous catalysis

Solution

All other processes require two phases and their interface. Homogeneous catalysis has the catalyst and all reactants in the same phase (e.g., all dissolved in solution), so no interface is needed.

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