Question

Mixture(s) showing positive deviation from Raoult's law at ${35}^o$C is(are):

• A. Carbon tetrachloride $+$ methanol
• B. Carbon disulphide $+$ acetone
• C. Benzene $+$ toluene
• D. Phenol $+$ aniline

Answer 1

Answer: (A), (B)

The correct options are
A Carbon disulphide $+$ acetone
B Carbon tetrachloride $+$ methanol

(A) $CC{l}_4+C{H}_{3}OH\Rightarrow$ Positive deviation from Raoults law.

Here, H- bonding in methanol is broken by $CC{l}_4$.

(B) image : Mixing of polar and non-polar liquids will produce a solution of weaker interaction, resulting positive deviation

(C) $C_6{H}_6+C_7{H}_8\Rightarrow$ Ideal solution

(D) image : Here stronger H-bonding is form leading to negative deviation.