Question

100 mL liquid A and 50 mL liquid B are mixed to form 138 mL solution. It :

• A. is an ideal solution
• B. has high boiling azeotrope
• C. has low boiling azeotrope
• D. none of the above

Answer 1

Answer: (B)

has high boiling azeotrope

Volume of A = 100ml ; volume of B = 50ml

Ideal solution = 100+50 = 150ml

Non ideal = 138 ml

$\Delta V$= 138-150= $-12<0$

This condition occurs when the vapour pressure of the solution is lesser then it should be.

Since the vapour pressure of the solution is lesser, therefore, the solution boils at a higher temperature.

Hence, the correct option is $\text{B}$