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Which one of the following is incorrect for ideal solution?
A
$\Delta P = P_{obs} - P_{calculated\ by\ Raoult's\ law} = 0$
B
$\Delta G_{mix} = 0$
C
$\Delta H_{mix} = 0$
D
$\Delta U_{mix} = 0$
Explanation
Mixing is spontaneous, so $\Delta G_{mix} < 0$.
Detailed Solution
For an ideal solution $\Delta H_{mix} = 0$, $\Delta U_{mix} = 0$ and $\Delta S_{mix} \ne 0$
According to $\Delta G_{mix} = \Delta H_{mix} - T\Delta S_{mix}$, $\Delta G_{mix} \ne 0$
So '$\Delta G_{mix} = 0$' is incorrect.
According to $\Delta G_{mix} = \Delta H_{mix} - T\Delta S_{mix}$, $\Delta G_{mix} \ne 0$
So '$\Delta G_{mix} = 0$' is incorrect.