Question

What is incorrect for ideal solutions?

• A. ${\Delta }_{mix}H$=0
• B. $\Delta mixV$=0
• C. solutions which obey Raoult's law over the entire range of concentration
• D. Solution in which observed vapour pressure is smaller than the ideal vapour pressure

Answer 1

The correct option is D Solution in which observed vapour pressure is smaller than the ideal vapour pressure

For ideal solution: ${\Delta }_{mix}H$=0 and $\Delta mixV$=0 and obeys Raoult's law over the entire range of concentration.
Solution in which observed vapour pressure is smaller than the ideal vapour pressure is is known as negative deviation from the Raoult's law. Hence option D is incorrect.