NEET 2016 Phase 2 · ChemistryPrevious Year Question

Which one of the following is incorrect for an ideal solution?

Answer: (D) $Δ G_{mi x} = 0$ . \textbf{Answer:} (D) $Δ G_{mi x} = 0$ \textbf{Solution:} For an ideal solution at constant $T$ and $P$ : $Δ H_{mi x} = 0$ (no enthalpy change on mixing) $Δ V_{mi x} = 0$ , hence $Δ U_{mi x} = 0$ It obeys Raoult's law over the whole range, so $Δ P = P_{o b s} - P_{c a l c} = 0$ .

A. $Δ H_{mi x} = 0$
B. $Δ U_{mi x} = 0$
C. $Δ P = P_{o b s} - P_{c a l c u l a t e d b y R a o u l t^{'} s l a w} = 0$
D. $Δ G_{mi x} = 0$ ✓

Correct Answer

(D) $Δ G_{mi x} = 0$

Solution & Explanation

\textbf{Answer:} (D) $Δ G_{mi x} = 0$ \textbf{Solution:} For an ideal solution at constant $T$ and $P$ : $Δ H_{mi x} = 0$ (no enthalpy change on mixing) $Δ V_{mi x} = 0$ , hence $Δ U_{mi x} = 0$ It obeys Raoult's law over the whole range, so $Δ P = P_{o b s} - P_{c a l c} = 0$ . However, mixing is a spontaneous process, so $Δ G_{mi x} < 0$ (negative), NOT zero. Therefore the incorrect statement is (D).

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