A small rise in temperature `underline("decreases ")`the rate of reaction.

Explanation

To solve the question, we need to analyze the statement and provide a corrected version based on our understanding of chemical kinetics.

### Step-by-Step Solution:

1. **Understand the Original Statement**: The original statement claims that "a small rise in temperature decreases the rate of reaction."

2. **Recall the Effect of Temperature on Reaction Rate**: In chemical kinetics, it is established that an increase in temperature generally leads to an increase in the rate of reaction. This is due to the fact that higher temperatures provide reactant molecules with more kinetic energy.

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