Ncert Exercises & Solutions

Intermolecular forces between two benzene molecules are nearly the same strength as those between two toluene molecules.

Incorrect statement among the following for a mixture of benzene and toluene is -

a. $∆_{mix}$ H= zero

b. Δ_mixV = Zero

c. These will form a minimum boiling azeotrope

d. These will not form an ideal solution

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, d)

Hint: For an ideal solution, solute-solute interaction = solute-solvent interaction = solvent-solvent interaction

The solution which follows Raoult’s law is known as the ideal solution. For an ideal solution, intermolecular forces between two benzene molecules are near of the same strength as those between two toluene molecules. For an ideal solution

∆ V_{mix}

= 0 and Δ_mixH = 0

Thus, the mixture of benzene and toluene is an example of an ideal solution, so statement c and d are incorrect.
Hence the correct option is the third option.

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