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  • Which of the following statements is true for an ideal solution?Option: 1 The heat of mixing is always positive.  </p

Which of the following statements is true for an ideal solution?

Option: 1

The heat of mixing is always positive.
 


Option: 2

The activity coefficients are always less than 1.
 


Option: 3

The vapour pressure of the solution is always lower than that of the pure components.

 


Option: 4

The excess Gibbs free energy of mixing is always negative.


Answers (1)

best_answer

An ideal solution is one in which the interactions between the two components are the same as the interactions between like molecules. In such a solution, the excess Gibbs free energy of mixing (\Delta G_{mix}) is always negative. This is because the mixing of the two components results in a decrease in the entropy of the system, which is compensated by a decrease in the enthalpy of the system.

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