AP EAMCET · Chemistry · Solutions

Which condition is not satisfied by an ideal solution?

A Both $Δ_{mix} H = 0$ and $Δ_{mix} S = 0$
B Obeyance on Raoult's law
C Both $Δ_{mix} H = 0$ and $Δ_{mix} V = 0$
D $Δ_{mix} H = 0$

Verified Solution

Answer & Solution

Correct Answer

(A) Both $Δ_{mix} H = 0$ and $Δ_{mix} S = 0$

Step-by-step Solution

Detailed explanation

We know that the ideal solution can be formed in accordance with the Raoult's law. Now, according to this law, the change in enthalpy of the reaction and change in the volume of the reaction before and after mixing should be equal to zero for ideal gas. Entropy of mixture always…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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