Question

Which of the following components form an ideal solution?
(A) Acetone and Benzene
(B) Benzene and Toluene
(C) Acetone and Ethanol
(D) Ethanol and Water

Answer 1

Hint : If the interaction between different molecules of the components does not differ from the interactions taking place between the molecules of each component is called an ideal solution. Ideal solutions obey Raoult’s law at all concentrations and temperatures.

Complete Step By Step Answer:
The solution obeying Raoult's law over the entire range of concentrations is called an ideal solution. If a solution does not obey Raoult's law then it is called a non-ideal solution. In an ideal solution, solute solute and solvent solvent interactions are almost similar to the interactions of solute solvent. The enthalpy of an ideal solution is zero. As the enthalpy of solution approaches zero, the behaviour of the solution becomes more ideal. The volume of mixing an ideal solution is equal to zero. Ideal mixtures exhibit properties that are analogous to those of a mixture of ideal gases in their gas phase. Liquids which have similar structure and polarities form an ideal solution. Since both benzene and toluene are non-polar, the intermolecular forces operating on them are almost similar. So, benzene and toluene form an ideal solution.
Therefore, option B is correct.

Note :
Raoult’s law can be applied only to solutions that are very dilute. This law is applicable only to solutions containing a non-volatile solute. This law cannot be applied to solutes which dissociate or associate in the particular solution. The total volume of solution is equal to sum of the volumes of the components for an ideal solution. During dissociation, heat is neither evolved or absorbed.