Ncert Exercises & Solutions

The strength of intermolecular forces between two benzene molecules is approximately equivalent to that between two toluene molecules.

(a)	ΔH_mix= zero
(b)	ΔV_mix = Zero
(c)	They will form a minimum boiling azeotrope
(d)	They will not form an ideal solution

Identify the incorrect statements (from a to d given above) regarding a mixture of benzene and toluene:

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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