MHT CET Medical202622 April 2026Evening ShiftChemistrySolutionsActual
Which of the following statements is NOT true about the ideal solution?
Options
- AIt obeys Raoult's law over the entire range of concentration.
- BThere is no heat evolved or absorbed when two components forming an ideal solution are mixed.
- CThere is no volume change when two components forming an ideal solution are mixed.
- DThe vapor pressure of the ideal solution can be higher or lower than those of pure components
Correct answer
D. The vapor pressure of the ideal solution can be higher or lower than those of pure components
Step-by-step solution
For an ideal solution, the following conditions hold true: 1. It obeys Raoult's law over the entire range of concentration. 2. The enthalpy of mixing is zero, i.e., H_ mix = 0 . No heat is evolved or absorbed. 3. The volume of mixing is zero, i.e., V_ mix = 0 . 4. The total vapor pressure of the solution is given by P_ total = P_ A ⁰ x_ A + P_ B ⁰ x_ B . Since x_ A + x_ B = 1 , the total vapor pressure is a weighted average of the vapor pressures of the pure components. Therefore, the vapor pressure of an ideal sol