Question

Which property is not found in the ideal solution?
A. ${{P}_{A}}\ne P_{A}^{0}\times {{X}_{A}}$
B. $\Delta {{H}_{mix}}\ne 0$
C. $\Delta {{V}_{mix}}\ne 0$
D. All of these

Answer 1

In a homogenous mixture of the particles or molecules, the properties of the solution should correspond to the physical and chemical properties of the particles or molecules. Then the solution is called the ideal solution.

Complete answer:
- In the question it is asked which property among the given options is not found in the ideal solution.
- The ideal solution should obey Henry's law after enough dilution also.
- The ideal solution which obeys Raoult’s law also.
- The Raoult’s law states that the vapor pressure of the solution is equal to the product of the partial pressure of the partial pressure of the solvent and mole fraction of the solvent.
- We can represent the above definition as below.
${{P}_{A}}=P_{A}^{0}\times {{X}_{A}}$
Here ${{P}_{A}}$ = vapor pressure of the solution
$P_{A}^{0}$ = partial pressure of the solvent
${{X}_{A}}$ = Mole fraction of the solvent.
- Therefore option A, ${{P}_{A}}\ne P_{A}^{0}\times {{X}_{A}}$ does not belong to ideal solution.
- For an ideal solution the enthalpy of mixing two components in a solution is zero. Means $\Delta {{H}_{mix}}=0$ , change in enthalpy of the solution should be zero.
- Therefore option B, $\Delta {{H}_{mix}}\ne 0$ does not belong to the ideal solution.
- In case of ideal solution the sum of the volume of the solute and volume of the solvent is equal to the volume of the solution.
- Therefore $\Delta {{V}_{mix}}=0$ .
- So, the option C, $\Delta {{V}_{mix}}\ne 0$ is not suitable for an ideal solution.

Therefore the correct option is D.

Note:
All the solutions in nature may not follow Raoult's law. Only ideal solutions obey Raoult's law. The change in volume of the solution by the addition of volume of the solvent and the volume of the solute should be zero.