AIIMS2019Chemistry-Solutions

AIIMS 2019 Chemistry Raoult's Law MCQ Question

Type: MCQ-conceptual-Medium-Class 12

Assertion : Ideal solutions obey Raoult's law. Reason : ΔHmix\Delta\text{H}_{\text{mix}} and ΔVmix\Delta\text{V}_{\text{mix}} for an ideal solution are less than zero.

A

If both assertion and reason are true and reason is correct explanation of assertion.

B

If both assertion and reason are true and reason is not correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Correct Answer

Option C

Detailed Explanation

In an ideal solution, the interactions between the molecules of the different components are similar to those between the molecules of the pure components, resulting in an enthalpy of mixing (ΔH_mix) of zero and a volume of mixing (ΔV_mix) of zero. This means that the energy and space occupied by the solution remain unchanged when the components are mixed, which is a characteristic of ideal behavior. Other options are not applicable or relevant in this context, as they do not provide any additional information or correct statements regarding ideal solutions. Understanding these properties helps clarify the conditions under which Raoult's law is valid and the nature of ideal solutions in thermodynamics.

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