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Assertion : At critical temperature, the...

Assertion : At critical temperature, the densities of the gaseous and liquid phase become equal.
Reason : At critical point, surface of separation between the lqiuid phase and the gaseous phase disappears.

A

Assertion and reason both are correct statements and reason is correct explanation for assertion.

B

Assertion and reason both are correct statements but reason is not correct explanation for assertion.

C

Assertion is correct statement but reason is wrong statement.

D

Assertion is wrong statement but reason is correct statement.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the assertion and reason question, we need to analyze both statements carefully. ### Step-by-Step Solution: **Step 1: Understand the Assertion** - The assertion states that "At critical temperature, the densities of the gaseous and liquid phase become equal." - Critical temperature is defined as the temperature above which a gas cannot be liquefied, regardless of the pressure applied. At this temperature, the properties of the liquid and gas phases converge. **Step 2: Analyze the Densities** - As the temperature approaches the critical temperature, the density of the liquid phase decreases while the density of the gas phase increases. - At the critical temperature, these two densities become equal. Therefore, the assertion is true. **Step 3: Understand the Reason** - The reason states that "At the critical point, the surface of separation between the liquid phase and the gaseous phase disappears." - When the densities of the liquid and gas phases become equal, they can no longer be distinguished from one another. This means that the interface or surface separating the two phases disappears, leading to a single phase. **Step 4: Analyze the Relationship** - The reason explains why the assertion is true. If the densities are equal, the distinct phases cannot exist separately, thus the surface of separation vanishes. **Step 5: Conclusion** - Both the assertion and the reason are true, and the reason correctly explains the assertion. ### Final Answer: Both the assertion and reason are correct, and the reason is a correct explanation of the assertion. ---
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