question_answer

Formation of a solution from two components can be considered as:                         [AIPMT 2003]

(1) pure solvent\[\to \]separated solvent molecules, \[\Delta {{H}_{1}}\]

(2) pure solute\[\to \]separated solute molecules, \[\Delta {{H}_{2}}\]

(3) separated solvent and solute molecules \[\to \] solution, \[\Delta {{H}_{3}}\]

Solution so formed will be ideal if:

A)  \[\Delta {{H}_{so\ln }}=\Delta {{H}_{1}}-\Delta {{H}_{2}}-\Delta {{H}_{3}}\]             

B)  \[\Delta {{H}_{so\ln }}=\Delta {{H}_{3}}-\Delta {{H}_{1}}-\Delta {{H}_{2}}\]

C) \[\Delta {{H}_{so\ln }}=\Delta {{H}_{1}}+\Delta {{H}_{2}}+\Delta {{H}_{3}}\]

D)                   \[\Delta {{H}_{so\ln }}=\Delta {{H}_{1}}+\Delta {{H}_{2}}-\Delta {{H}_{3}}\]

Correct Answer: C

Solution :

For ideal solution,