State True or False
Decrease in Temperature may cause liquefaction of gases .

Answer

To determine whether the statement "Decrease in Temperature may cause liquefaction of gases" is true or false, we can analyze the behavior of gas molecules in relation to temperature and kinetic energy.

### Step-by-Step Solution:

1. **Understanding Temperature and Kinetic Energy**:
- Temperature is a measure of the average kinetic energy of gas molecules. As temperature decreases, the kinetic energy of the gas molecules also decreases.

2. **Effect of Decreased Kinetic Energy**:
- When the kinetic energy of gas molecules decreases, the molecules move more slowly. This reduction in speed means that the molecules are less able to overcome intermolecular forces.

3. **Molecular Proximity**:
- With lower kinetic energy, gas molecules tend to come closer together. The decreased movement allows the attractive forces between the molecules to become more significant.

4. **Increased Intermolecular Interactions**:
- As the molecules come closer, the interactions between them increase. This leads to a greater likelihood of the molecules sticking together, which is essential for a phase change from gas to liquid.

5. **Phase Change to Liquid**:
- If the temperature continues to decrease, the gas molecules can eventually lose enough kinetic energy that they will condense into a liquid state. This process is known as liquefaction.

6. **Conclusion**:
- Therefore, the statement "Decrease in Temperature may cause liquefaction of gases" is true.

### Final Answer:
**True**

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