Formation of a solution from two components can be considered as … - Vidyadip

MCQ

Formation of a solution from two components can be considered as

$(i)$ Pure solvent $\to$ separated solvent molecules $\Delta$ $H_1$

$(ii)$ Pure solute $\to$ separated solute molecules$\Delta$ $H_2$

$(iii)$ Separated solvent and solute molecules $\to$ solution $\Delta H_3$ Solution so formed will be ideal if

A
$\Delta {H_{{\rm{soln}}}} = \Delta {H_3} - \Delta {H_1} - \Delta {H_2}$
✓
$\Delta {H_{{\rm{soln}}}} = \Delta {H_1} + \Delta {H_2} + \Delta {H_3}$
C
$\Delta {H_{{\rm{soln}}}} = \Delta {H_1} + \Delta {H_2} - \Delta {H_3}$
D
$\Delta {H_{{\rm{soln}}}} = \Delta {H_1} - \Delta {H_2} - \Delta {H_3}$

✓

Answer

Correct option: B.

$\Delta {H_{{\rm{soln}}}} = \Delta {H_1} + \Delta {H_2} + \Delta {H_3}$

b
Solution so formed will be ideal if $\Delta H _{\text {soln. }}=\Delta H _1+\Delta H _2+\Delta H _3$

Adding $(i)$ to $(iii)$

pure solute + pure solvent $\rightarrow$ solution;

$\Delta H =\Delta H _1+\Delta H _2+\Delta H _3$

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