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Question

Identify the false statement:

A
The volume of a solution cannot be less than the sum of the volumes of the pure solvent and the solute used to prepare the solution (binary solution of two liquids)
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B
At constant T and P, ΔGmix will be necessarily negative for an ideal solution
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C
An ideal binary solution cannot form an azeotropic mixture
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D
In binary solutions, ideality is more of an exception rather than a rule
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Solution

The correct option is A The volume of a solution cannot be less than the sum of the volumes of the pure solvent and the solute used to prepare the solution (binary solution of two liquids)
  • In case of non-ideal liquid-liquid solutions, the volume of the solution can be both less than or more than the sum of the volumes of the solute and the solvent depending on the intermolecular interactions between them
  • For an ideal solution ΔH=0 and ΔS>0 so ΔGmix will be necessarily negative
  • For an ideal solution, there will be no concentration possible at which both the solute and solvent will boil together
  • To obtain an ideal solution we have to take a solute and a solvent which do not have any intermolecular interactions which is impossible. There are solutions that tend to ideal behaviour like that of benzene and toluene.

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