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 c omposition of the vapour phase is same as that of the liquid phase of an azeotropic mixture.

Options

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.

Answer

To solve the given question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that azeotropic mixtures are formed only by non-ideal solutions and that they may have boiling points either greater than both components or less than both components.
- Azeotropic mixtures indeed occur in non-ideal solutions due to interactions between different components that lead to deviations from Raoult's law. This can result in boiling points that are either higher or lower than the boiling points of the pure components.

2. **Understanding the Reason**:
- The reason states that the composition of the vapor phase is the same as that of the liquid phase in an azeotropic mixture.
- This is a defining characteristic of azeotropes. At the azeotropic composition, the vapor and liquid phases are in equilibrium, meaning they have the same composition.

3. **Evaluating the Truth of the Statements**:
- Both the assertion and the reason are true statements. Azeotropes are indeed formed from non-ideal solutions, and at the azeotropic point, the vapor and liquid compositions are identical.

4. **Determining the Relationship**:
- The assertion is true, and the reason is also true. However, we need to check if the reason provides a correct explanation for the assertion.
- The assertion discusses the nature of azeotropic mixtures and their boiling points, while the reason describes the equilibrium condition of vapor and liquid phases. Although both statements are true, the reason does not explain why azeotropes can have boiling points higher or lower than the components.

5. **Conclusion**:
- Since both the assertion and reason are true, but the reason does not correctly explain the assertion, the answer to the question is that the assertion is true, and the reason is true but not the correct explanation of the assertion.

### Final Answer:
- The assertion is true, and the reason is true but does not correctly explain the assertion.