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Question

When an ideal solution is formed?


A

When its components have no volume change on mixing

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B

When its components have no enthalpy change on mixing

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C

When its components have both the above characteristics

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D

When its components have high solubility.

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Solution

The correct option is C

When its components have both the above characteristics


The correct option is (C)

(C) When its components have both the above characteristics

  • An ideal solution is one that follows Raoult's law exactly over the whole concentration range. Such solutions are created by combining two components that are nearly equivalent in molecule size, structure, and intermolecular interactions.
  • An ideal solution should satisfy some conditions:
    When the two components are mixed together, there will be no change in volume, i.e.ΔVmixing=0
  • When the two components are combined, there will be no change in enthalpy (i.e., no heat energy is absorbed or released), i.e.ΔHmix=0

So, this is the correct option.

(A) When its components have no volume change on mixing

The ideal solution not only follows this condition but also some other conditions are there. So, this is an incorrect answer.

(B) When its components have no enthalpy change on mixing

The ideal solution not only follows this condition but also some other conditions are there. So, this is an incorrect answer.

(D) When its components have high solubility.

This is not a condition for forming the ideal solution. So, this is an incorrect option.

Hence. The correct option is (C).


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