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(C) An ideal solution is defined as a solution that obeys Raoult's law over the entire range of concentration. For an ideal solution,the following

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The enthalpy of mixing is zero.

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(C) An ideal solution is defined as a solution that obeys Raoult's law over the entire range of concentration. For an ideal solution,the following conditions must be met: $1$. The enthalpy of mixing,$\Delta H_{mix} = 0$. $2$. The volume of mixing,$\Delta V_{mix} = 0$. $3$. The entropy of mixing,$\Delta S_{mix} > 0$. $4$. The Gibbs energy of mixing,$\Delta G_{mix} < 0$. Since $\Delta G_{mix} = \Delta H_{mix} - T \Delta S_{mix}$,and $\Delta H_{mix} = 0$ while $\Delta S_{mix} > 0$,it follows that $\Delta G_{mix} < 0$. Therefore,the correct statement is that the enthalpy of mixing is zero.

If liquids $A$ and $B$ form an ideal solution,then which of the following is true?

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