Q1 / 160 · TS EAMCET 2017 · Chemistry

Which of the following conditions are correct for real solutions showing negative deviation from Raoult's law?

  • A
    $\Delta H_{\text {MIX }} < 0 ; \Delta V_{\text {MI }}>0$
  • B
    $\Delta H_{\text {Mix }}>0 ; \Delta V_{\text {Mix }}>0$
  • C
    $\Delta H_{\text {Mix }}>0 ; \Delta V_{\text {Mix }} < 0$
  • Correct answer
    D
    $\Delta H_{\text {Mix }} < 0 ; \Delta V_{\text {Mix }} < 0$

Solution

Conditions that are correct for real solutions showing negative deviation from Raoult's law are as follows $$ \begin{aligned} & p_A < p_A{ }^{\circ} x_A \text { and } p_B < p_A{ }^{\circ} x_B \\ & \Delta_{\text {mix }} H=- \text { ve } \end{aligned} $$ Dissolution is exothemic heating decreases solubility $\Delta_{\text {mixing }} V=-$ ve

Hence, the correct answer is option: 'D'.

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