The liquefaction behaviour of temporary gases approacches that of perrmanent gases as we go

Options

A. below critical temperature
B. above critical temperature
C. above absolute zero
D. below absolute zero

Answer

To solve the question regarding the liquefaction behavior of temporary gases as it approaches that of permanent gases, we need to understand the concepts of critical temperature and the behavior of gases under different conditions.

### Step-by-Step Solution:

1. **Understanding Temporary and Permanent Gases**:
- Temporary gases (or non-permanent gases) are those that can be liquefied under certain conditions (like temperature and pressure). Examples include gases like hydrogen and oxygen.
- Permanent gases (or non-liquefiable gases) cannot be liquefied regardless of the pressure applied, as they have a critical temperature above which they cannot be liquefied.

2. **Defining Critical Temperature**:
- The critical temperature is the highest temperature at which a gas can be converted to a liquid by applying pressure. Below this temperature, gases can be liquefied by increasing pressure.

3. **Analyzing the Options**:
- **Option A: Below critical temperature** - This is the correct answer. Below the critical temperature, temporary gases can behave more like permanent gases as they can be liquefied.
- **Option B: Above critical temperature** - This is incorrect because above the critical temperature, gases cannot be liquefied, regardless of the pressure applied.
- **Option C: Above absolute zero** - This option is misleading. While all gases exist above absolute zero, it does not relate to the liquefaction behavior.
- **Option D: Below absolute zero** - This is not physically possible since absolute zero (0 Kelvin) is the lowest limit of temperature.

4. **Conclusion**:
- Therefore, the correct answer is **Option A: Below critical temperature**. This is where the liquefaction behavior of temporary gases approaches that of permanent gases.