When two liquids A and B are mixed, their boiling points become greater than both of them. The mixture is :

Options

A. Ideal solution
B. Positive deviation with non ideal solution
C. Negative deviation with non ideal solution
D. Normal solution

Answer

To solve the question, we need to analyze the behavior of the two liquids A and B when they are mixed together. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Concept of Boiling Points
- The boiling point of a liquid is the temperature at which its vapor pressure equals the atmospheric pressure. When two liquids are mixed, the resulting boiling point can either increase or decrease depending on their interactions.

**Hint:** Recall that the boiling point is influenced by intermolecular forces between the molecules of the liquids.

### Step 2: Identify the Types of Solutions
- There are two main types of solutions based on their deviation from Raoult's law:
1. **Ideal Solutions**: Follow Raoult's law perfectly. The boiling point of the mixture is expected to be between the boiling points of the two components.
2. **Non-Ideal Solutions**: These can show either positive or negative deviations from Raoult's law.
- **Positive Deviation**: The vapor pressure of the solution is higher than predicted by Raoult's law, leading to a higher boiling point.
- **Negative Deviation**: The vapor pressure is lower than predicted, resulting in a lower boiling point.

**Hint:** Consider how the interactions between different molecules can affect the boiling point of the mixture.

### Step 3: Analyze the Given Information
- The question states that when liquids A and B are mixed, their boiling points become greater than both of them. This indicates that the mixture does not behave ideally and shows a positive deviation from Raoult's law.

**Hint:** Think about how the interactions between A and B might lead to a higher boiling point.

### Step 4: Conclusion
- Since the boiling point of the mixture is greater than that of both pure liquids, we conclude that the mixture is a **non-ideal solution with positive deviation** from Raoult's law.

**Hint:** Remember that the key characteristic of a positive deviation is that the mixture has a higher boiling point than either of the individual components.

### Final Answer
The mixture is a **non-ideal solution with positive deviation** (Option B).