Gas deviates from ideal gas bahaviour because molecules

Options

A. are colourless
B. attract each other
C. contain covalent bond
D. show brownian movement

Answer

To solve the question "Gas deviates from ideal gas behaviour because molecules...", we need to understand the reasons behind the deviation of real gases from ideal gas behavior.

### Step-by-Step Solution:

1. **Understanding Ideal Gas Behavior**:
- Ideal gases are defined by the ideal gas law, which assumes that gas molecules do not attract or repel each other and occupy no volume. This means that the interactions between gas molecules are negligible.

**Hint**: Recall the assumptions of the ideal gas law: no intermolecular forces and no volume occupied by gas molecules.

2. **Real Gases vs. Ideal Gases**:
- In reality, gas molecules do experience intermolecular forces, which can be either attractive or repulsive. These forces become significant at high pressures and low temperatures.

**Hint**: Consider how changes in pressure and temperature affect the behavior of gas molecules.

3. **Attractive Forces**:
- When gas molecules attract each other, they tend to come closer together, which can lead to a decrease in the volume that the gas occupies compared to what would be predicted by the ideal gas law.

**Hint**: Think about how attraction between molecules can affect their spacing and the overall volume of the gas.

4. **Repulsive Forces**:
- Conversely, repulsive forces can occur when gas molecules are forced too close together, which can also lead to deviations from ideal behavior. These forces can prevent the gas from compressing as much as an ideal gas would.

**Hint**: Remember that repulsion occurs at very short distances between molecules, affecting how they behave under compression.

5. **Conclusion**:
- Therefore, the deviation from ideal gas behavior is primarily due to the presence of intermolecular forces (both attractive and repulsive) between gas molecules. This results in a change in volume and pressure that does not align with the predictions of the ideal gas law.

**Hint**: Summarize the main reasons for deviation: intermolecular forces lead to changes in volume and pressure.

### Final Answer:
Gas deviates from ideal gas behavior because molecules attract or repel each other due to intermolecular forces.