Q.

Mixture(s) showing positive deviation from Raoult’s law at 35°C is (are)

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a

carbon tetrachloride+methanol

b

benzene+toluene

c

carbon disulphide+acetone

d

phenol+aniline 

answer is A, B.

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Detailed Solution

(A) CCl4​+CH3​OH⇒ Positive deviation from Raoult's law.

Here, H- bonding in methanol is broken by CCl4.

(B) Mixing of polar and non-polar liquids will produce a solution of weaker interaction, resulting in positive deviation for the mixture of carbon disulphide and acetone.

(C) C6​H6​+C7​H8​⇒ Ideal solution.

(D) Stronger H-bonding is formed in the mixture oof phenol and aniline, leading to negative deviation.

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