Select the appropriate property of an ideal gas

Options

A. its molecules are infinitesimally small
B. There are no forces of interaction between its molecules
C. It strictly obeys the ideal gas laws
D. All of these

Answer

To solve the question regarding the properties of an ideal gas, we will analyze each option provided and determine which properties are characteristic of an ideal gas.

### Step-by-Step Solution:

1. **Understanding Ideal Gas**: An ideal gas is defined as a hypothetical gas that perfectly follows the gas laws (Boyle's Law, Charles's Law, and Gay-Lussac's Law) under all conditions of temperature and pressure.

2. **Analyzing Option 1**: "Its molecules are infinitely small."
- According to the kinetic theory of gases, the volume of individual gas molecules is negligible compared to the volume of the container. Therefore, this statement is true.

3. **Analyzing Option 2**: "There are no forces of attraction between the molecules."
- The kinetic theory also states that gas molecules are far apart, and the forces of attraction between them are negligible. Hence, this statement is also true.

4. **Analyzing Option 3**: "It follows all the gas laws."
- An ideal gas is defined by its adherence to all gas laws. Thus, this statement is true.

5. **Conclusion**: Since all the options presented (1, 2, and 3) are true, the correct answer is that all these properties are characteristics of an ideal gas. Therefore, the appropriate response is that all of the above options are correct.

### Final Answer:
All of the above options are correct properties of an ideal gas.

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