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Assertion : Azeotropic mixtures are form...

Assertion : Azeotropic mixtures are formed only by non - ideal solutions and they may have boiling points either greater than both the components or less than both the compontents.
Reason : The composition of the vapour phase is same as that of the liquid phase of an azeotropic mixture.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If assertion is false but reason is true.

Text Solution

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The correct Answer is:
To solve the assertion and reason question regarding azeotropic mixtures, we will analyze both the assertion and the reason step by step. ### Step 1: Analyze the Assertion **Assertion:** "Azeotropic mixtures are formed only by non-ideal solutions and they may have boiling points either greater than both the components or less than both the components." - **Understanding Azeotropic Mixtures:** Azeotropic mixtures are specific mixtures of two or more liquids that have a constant boiling point and maintain the same composition in both the liquid and vapor phases during boiling. - **Non-Ideal Solutions:** Azeotropes are typically formed by non-ideal solutions, which do not follow Raoult's Law. This means that the interactions between the molecules in the mixture are different from those in the pure components. - **Boiling Points:** Azeotropic mixtures can indeed have boiling points that are either higher or lower than the boiling points of the individual components due to the unique interactions between the components. **Conclusion for Assertion:** The assertion is **true**. ### Step 2: Analyze the Reason **Reason:** "The composition of the vapor phase is the same as that of the liquid phase of an azeotropic mixture." - **Composition in Azeotropes:** By definition, in an azeotropic mixture, the composition of the vapor phase is indeed the same as that of the liquid phase at the boiling point. This is a characteristic feature of azeotropes. **Conclusion for Reason:** The reason is also **true**. ### Step 3: Determine the Relationship Between Assertion and Reason - While both the assertion and reason are true, the reason does not explain why azeotropic mixtures have boiling points that can be greater than or less than their components. The boiling point behavior is primarily due to the interactions between the components, which is not addressed in the reason. ### Final Conclusion Since both the assertion and reason are true, but the reason is not the correct explanation of the assertion, the correct option is **Option 2**: Both assertion and reason are true, but the reason is not the correct explanation of the assertion. ---
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