Discussion
Which of the following slows down the reaction rate?
Answer: D
The answer is None of the above.
A catalyst, whether homogeneous (in the same phase as the reactants) or heterogeneous (in a different phase, such as a solid catalyst for gases), increases the rate of reaction by providing a path of lower activation energy. A promoter is a substance that increases the activity of a catalyst, as molybdenum does for iron in the Haber process.
Substances that slow a reaction are inhibitors (or poisons, for catalysts), and none is listed among the options, so 'None of the above' is correct.
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