Which condition is not satisfied by an ideal solution?

Options

A. `Delta_(mix)H=0`
B. `Delta_(mix)V=0`
C. `Delta_(mix)S=0`
D. Obeyance of Raoult's law

Explanation

To determine which condition is not satisfied by an ideal solution, we first need to understand the characteristics of an ideal solution. Here’s a step-by-step breakdown of the conditions for an ideal solution:

### Step 1: Understand Raoult's Law
An ideal solution must obey Raoult's law, which states that the partial vapor pressure of each component in a solution is equal to the vapor pressure of the pure component multiplied by its mole fraction in the solution.

**Hint:** Remember that Raoult's law applies to ideal solutions and is a key characteristic.

### Step 2: Enthalpy Change (ΔH)
For an ideal solution, the enthalpy change (ΔH) upon mixing should be zero. This means that there is no heat absorbed or released when the components are mixed.

**Hint:** Think about how ideal solutions do not interact significantly with each other, leading to no heat change.

### Step 3: Volume Change (ΔV)
The volume change (ΔV) upon mixing should also be zero for an ideal solution. This indicates that the total volume of the solution is equal to the sum of the volumes of the individual components.

**Hint:** Consider how ideal solutions behave similarly to their pure components in terms of volume.

### Step 4: Intermolecular Interactions
In an ideal solution, the interactions between different molecules (AB) should be equal to the interactions between like molecules (AA and BB). This means that the forces between different types of molecules are the same as those between similar types.

**Hint:** This condition reflects the uniformity of interactions in an ideal solution.

### Step 5: Entropy Change (ΔS)
The change in entropy (ΔS) of the mixture should be greater than zero. This means that the randomness or disorder of the system increases upon mixing.

**Hint:** Remember that an increase in disorder is a characteristic of mixing, which should lead to a positive ΔS.

### Conclusion
Based on the above conditions, the condition that is not satisfied by an ideal solution is that the change in entropy (ΔS) of the mixture should be greater than zero, which means ΔS = 0 is not applicable for an ideal solution.

Thus, the answer to the question "Which condition is not satisfied by an ideal solution?" is that the change in entropy (ΔS) of the mixture is zero.

### Final Answer
The condition that is not satisfied by an ideal solution is: **ΔS of mixture = 0**.