Question

When we make a binary solution of $HN{O}_3$ in $H_{2}O$, deviation from Raoult’s law is observed.
Which of the following option(s) is/are correct

• A. $\Delta H_{mixing}<0$
• B. $\Delta V_{mixing}<0$
  
• C. $P_{H_{2}O}<P_{H_{2}O}^0{X}_{H_{2}O}$
  
• D. $\Delta S_{mixing}<0$

Answer 1

Answer: (A), (B), (C)

The correct options are
A $\Delta H_{mixing}<0$
B $\Delta V_{mixing}<0$

C $P_{H_{2}O}<P_{H_{2}O}^0{X}_{H_{2}O}$


The solution has extensive hydration of $H^{+}$ ions, and this shows negative deviation from ideality. For such a solution we have,
$\Delta H_{mixing}<0$
$\Delta V_{mixing}<0$
$P<P{°}_A{X}_A$
$\Delta S_{mixing}>0$