Which of the following liquid pairs shows a positive deviation from Raoult's law?

Options

A. Water - nitric acid
B. water - sulphric acid
C. water - hydrochloric acid
D. Acetone - chloriform

Answer

A

Explanation

Vapour pressure of mixture of
`(CHCl_(3)xx CH_(2)Cl_(2))rArr P_(A)^(@)X_(A)+P_(B)^(@)xx X_(B)`
`rArr 200xx(25.5)/((119.5)/((25.5)/(119.5+(40)/(85))))+41.5 xx (40)/((85)/((40)/(85)+(25.5)/(119.5)))`
= 90.84 mmHg