Question

100 ml of liquid A and 25 ml of liquid B is mixed to give a solution which does not obey Raoult's law. The volume of the solution :

• A. will be 125 ml
• B. can be > or < than 125 ml
• C. can be greater than, equal to or less than 125 ml
• D. will be less than 125 ml

Answer 1

Answer: (B)

can be > or < than 125 ml

When liquid A and liquid B forms an ideal solution, the total volume will be equal to the sum of the individual volumes.

$V_{total}=V_A+V_B=100+25=125ml$.

However if the solution shows deviation from Raoult's law, the total volume will be either less than (for negative deviation) or greater than (for positive deviation) 125 ml.