Single Choice

Which one of the following is incorrect for ideal solution?

A$$\triangle P = P_{obs} - P {\text{calculated by Raoult's law}} = 0$$
B$$\triangle G_{mix} = 0$$
Correct Answer
C$$\triangle H_{mix} = 0$$
D$$\triangle U_{mix} = 0$$

Solution


The concept of an ideal solution is fundamental to chemical thermodynamics and its applications, such as the use of colligative properties. An ideal solution or ideal mixture is a solution in which the enthalpy of solution ( ΔHsolution=0 ) is zero; with the closer to zero the enthalpy of solution, the more "ideal" the behavior of the solution becomes.

Since the enthalpy of mixing (solution) is zero, the change in Gibbs energy on mixing is determined solely by the entropy of mixing ( ΔS solution ).

So the $$\Delta G$$ is not zero.

Hence option B is correct.

SIMILAR QUESTIONS

Solutions

If Raoult's law is obeyed, then vapour pressure of the solvent in a solution is directly proportional to:

Solutions

The weight of an empty china dish is 39 g and when a saturated solution of potassium nitrate is poured into, its weight is 108 g at $$50^{\circ}C$$. After evaporating the solution to dryness, if the weight of the dish along with the crystals is 72 g then the solubility of potassium nitrate at $$50^{\circ} C$$ is .....................

Solutions

For a dilute solution, Raoult's law states that:

Solutions

The mixture which shows positive deviation from Raoult’s law is

Solutions

For a dilute solution, Raoult's law states that:

Solutions

Which of the following is satisfied by an ideal solution?

Solutions

What are the similarities between Raoult's Law and Henry's Law

Solutions

State the following : Raoult's law in its general form in reference to solutions .

Solutions

State Raoult's law for the solution containing volatile components. Write two differences between an ideal solution and a non-ideal solution.

Solutions

The relative lowering of the vapour pressure is equal to the ratio between the number:

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