NEET 2019 · ChemistryPrevious Year Question

For an ideal solution, the correct option is:

Answer: (C) $Δ_{mi x} H = 0$ at constant T and P. \textbf{Answer:} (C) $Δ_{mi x} H = 0$ at constant T and P \textbf{Solution:} For an ideal solution at constant $T$ and $P$ : $Δ_{mi x} H = 0$ (no heat absorbed or released on mixing) — correct.

A. $Δ_{mi x} S = 0$ at constant T and P
B. $Δ_{mi x} V \neq = 0$ at constant T and P
C. $Δ_{mi x} H = 0$ at constant T and P✓
D. $Δ_{mi x} G = 0$ at constant T and P

Correct Answer

Solution & Explanation

\textbf{Answer:} (C) $Δ_{mi x} H = 0$ at constant T and P \textbf{Solution:} For an ideal solution at constant $T$ and $P$ : $Δ_{mi x} H = 0$ (no heat absorbed or released on mixing) — correct. $Δ_{mi x} V = 0$ (no volume change), so option B is wrong. $Δ_{mi x} S > 0$ (entropy increases on mixing), so option A is wrong. $Δ_{mi x} G < 0$ (mixing is spontaneous), so option D is wrong. Hence the correct option is (C).

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