Vapour pressure of solution containing 2 mol of liquid A (`P_A^@ = 80` torr) and 3 mol of liquid B (`P_B^@= 100` torr) is 87 torr. We canconclude that

Options

A. there is negative deviation from Raoult's law
B. boiling point is higher than that expected for ideal solution
C. molecular attractions between unlike molecules arestronger than those between like molecules
D. all of these statements are correct

Answer

D

Explanation

For ideal solution vapour pressure of solution `=P_A^@x_A + P_B^@x_B`
`80xx2/5 + 100 xx3/5 = 92` torr
Since observed vapour pressure of solution >ideal vapour pressure, the solution shows negative deviation.