Question

Assertion (A): \( \Delta_{\text{mix}} H \) and \( \Delta_{\text{mix}} V \) are zero for an ideal solution. Reason (R): The solution which obeys Raoult’s law over the entire range of concentration is called an ideal solution.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false.
• D. Assertion (A) is false, but Reason (R) is true.

Hint:

Reaction rates usually increase with temperature due to an increase in the number of molecules with energy greater than the activation energy.

Answer 1

The Correct Option is B

For an ideal solution: - \( \Delta_{\text{mix}} H = 0 \) because there is no enthalpy change upon mixing, meaning the interactions between solute and solvent are similar to those in the pure components.
- \( \Delta_{\text{mix}} V = 0 \) because there is no volume change when components mix ideally. Although Raoult’s law describes an ideal solution, it does not directly explain why \( \Delta H \) and \( \Delta V \) are zero.