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In a catalytic reaction, promoters and poisons are substances that:

1. Enhance and decrease the activity of a catalyst, respectively
2. Decrease and enhance the activity of a catalyst, respectively
3. Have no effect on the catalyst
4. Can be used in place of a catalyst whenever required

Correct answer: Enhance and decrease the activity of a catalyst, respectively

Solution

Promoters (also called activators) enhance the efficiency of a catalyst, while poisons (inhibitors) reduce or completely destroy the catalytic activity. These are the standard definitions in surface chemistry.

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