For an ideal solution of two components A and B, which of the following is true?

Options

A. `DeltaH_("mixing") lt 0` (zero)
B. `A - A, B-B` and `A-B` interations ae identical
C. `A -B` interaction is stronger than `A-A` and `B-B` interactions
D. `DeltaH_("mixing") gt 0` (zero)

Answer

To solve the question regarding the characteristics of an ideal solution of two components A and B, we will analyze the properties of ideal solutions step by step.

### Step-by-Step Solution:

1. **Understanding Ideal Solutions**:
- An ideal solution is a mixture of two or more components that behaves according to Raoult's law. In an ideal solution, the interactions between the molecules of different components are similar to the interactions between the molecules of the same component.

2. **Key Characteristics of Ideal Solutions**:
- The interaction energy between A and A (AA), B and B (BB), and A and B (AB) are equal.
- The change in enthalpy (ΔH) of mixing is zero, meaning no heat is absorbed or released when the components are mixed.
- The change in volume (ΔV) of mixing is also zero, indicating that the total volume of the solution is the sum of the volumes of the individual components.

3. **Analyzing the Options**:
- **Option A**: "ΔH of mixing is less than zero."
- This is incorrect for ideal solutions; it indicates a negative deviation, which is characteristic of non-ideal solutions.
- **Option B**: "AA and BB interactions are identical to AB interactions."
- This is correct. In an ideal solution, the interactions between the same components (AA and BB) are equal to the interactions between different components (AB).
- **Option C**: "AB interaction is stronger than AA and BB interaction."
- This is incorrect; stronger AB interactions indicate a positive deviation from ideal behavior.
- **Option D**: "ΔH of mixing is greater than zero."
- This is also incorrect for ideal solutions; it suggests a positive deviation.

4. **Conclusion**:
- The correct statement regarding an ideal solution of two components A and B is that the interactions between A and A, B and B, and A and B are identical. Therefore, the correct answer is **Option B**.