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Formation of a solution from two components can be considered as :
(i) Pure solvent \( \rightarrow \) separated solvent molecules, \( \Delta H_{1} \)
(ii) Pure solute \( \rightarrow \) separated solute molecules, \( \Delta \mathrm{H}_{2} \)
(iii) separated solvent and solute molecules \( \rightarrow \) solution, \( \Delta H_{3} \)
Solution so formed will be ideal if :
(a) \( \Delta H_{\text {Soln }}=\Delta H_{1}+\Delta H_{2}+\Delta H_{3} \)
(b) \( \Delta H_{\text {Soln }}=\Delta H_{1}+\Delta H_{2}-\Delta H_{3} \)
(c) \( \Delta H_{\text {Soln }}=\Delta H_{1}-\Delta H_{2}-\Delta H_{3} \)
(d) \( \Delta H_{\text {Soln }}=\Delta H_{3}-\Delta H_{1}-\Delta H_{2} \)
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