Question

Negative deviation from Raoult’s law is observed in which
one of the following binary liquid mixtures?
(a) Ethanol and acetone
(b) Benzene and toluene
(c) Acetone and chloroform
(d) Chloroethane and bromoethane

Answer 1

Negative deviation from Raoult’s law is observed in the binary liquid mixture of Acetone and chloroform

- this is due to the fact that chloroform molecule forms hydrogen bonds with acetone molecule

- this decreases the escaping tendency of of molecules

- due to this vapour pressure decreases which results in the negative deviation from Raoult's law

- so option (c) is correct