Question
Chemistry Question on Solutions
An azeotropic solution of two liquids has boiling point lower than either of them when it
A
shows negative deviation from Raoult- law
B
shows no deviation from Raoult's law
C
shows positive deviation from Raoult- law
D
is saturated
Answer
shows positive deviation from Raoult- law
Explanation
Solution
In case of positive deviation from Raoult's law, the observed vapour pressure is greater than the ideal vapour pressure and boiling point of azeotrope becomes lower than either of pure liquid.