An ideal solution is that which

Options

A. Shows positive deviation from Raoults law
B. Shows negative deviation from Raoults law
C. Has no connection with Raoults law
D. Obeys Raoults law

Answer

To solve the question "An ideal solution is that which", we need to understand the characteristics of ideal solutions in relation to Raoult's law.

### Step-by-Step Solution:

1. **Understanding Raoult's Law**:
- Raoult's law states that the partial vapor pressure of each component in an ideal solution is directly proportional to its mole fraction in the solution. This means that the behavior of the solution can be predicted based on the concentrations of its components.

2. **Characteristics of Ideal Solutions**:
- An ideal solution is one that follows Raoult's law at all concentrations and temperatures. In an ideal solution, the interactions between the molecules of the solute and solvent are similar to the interactions between the molecules of the solute and the solvent themselves.

3. **Identifying the Options**:
- Option A: Shows positive deviation from Raoult's law - This is incorrect as positive deviation indicates that the solution does not behave ideally.
- Option B: Shows negative deviation from Raoult's law - This is also incorrect as negative deviation indicates non-ideal behavior.
- Option C: Has no connection with Raoult's law - This is incorrect because ideal solutions are defined by their adherence to Raoult's law.
- Option D: Obeys Raoult's law - This is correct as ideal solutions are characterized by their compliance with Raoult's law at all concentrations and temperatures.

4. **Conclusion**:
- The correct answer is **Option D: obey Raoult's law**.