Kinetic energy of molecules ……........ with decrease in temperature.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Kinetic Energy**: Kinetic energy is the energy that an object possesses due to its motion. In the context of molecules, it refers to the energy associated with the movement of molecules in a substance.

2. **Effect of Temperature on Kinetic Energy**: Temperature is a measure of the average kinetic energy of the molecules in a substance. As the temperature increases, the kinetic energy of the molecules also increases because they move faster.

3. **Decrease in Temperature**: When the temperature decreases, the average kinetic energy of the molecules also decreases. This is because lower temperatures mean that the molecules have less energy to move.

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