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The vapour of a substance behaves as a g...

The vapour of a substance behaves as a gas

A

below critical temperature

B

above critical temperature

C

at `100^(@)C`

D

at `1000^(@)C`

Text Solution

AI Generated Solution

The correct Answer is:
To determine when the vapor of a substance behaves as a gas, we need to understand the concept of critical temperature. Here’s a step-by-step solution: ### Step 1: Understand Critical Temperature - **Definition**: The critical temperature of a substance is the highest temperature at which it can exist as a liquid. Above this temperature, the substance cannot be liquefied, regardless of the pressure applied. ### Step 2: Analyze the Options - We are given four options to consider: 1. Below critical temperature 2. Above critical temperature 3. At 100 degrees Celsius 4. At 1000 degrees Celsius ### Step 3: Evaluate Each Option - **Option 1: Below Critical Temperature** - At temperatures below the critical temperature, the substance can exist as a liquid. If it is in the liquid state, it does not behave like a gas. Therefore, this option is incorrect. - **Option 2: Above Critical Temperature** - At temperatures above the critical temperature, the substance cannot be liquefied, regardless of the pressure. In this state, it behaves entirely as a gas. Thus, this option is correct. - **Option 3: At 100 degrees Celsius** - The temperature of 100 degrees Celsius is specific to water, where it changes from liquid to vapor. However, this is not a general condition for all substances. Therefore, this option is incorrect. - **Option 4: At 1000 degrees Celsius** - Similar to option 3, this temperature is not universally applicable to all substances. It may be above the critical temperature for some substances, but it does not guarantee that the vapor behaves as a gas for all substances. Thus, this option is also incorrect. ### Step 4: Conclusion - The only option that universally applies to all substances is **Option 2: Above Critical Temperature**. This is when the vapor of a substance behaves as a gas. ### Final Answer - The vapor of a substance behaves as a gas **above critical temperature**. ---
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