Formation of a solution from two components can be considered as
(i) Pure solvent $\to$ separated solvent molecules, $∆$ H₁
(ii) Pure solute $\to$ separated solute molecules, $∆$ H₂
(iii) Separated solvent & solute molecules + solution, $∆$ H₃
Solution so formed will be ideal if

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${ΔH}_{soln} = {ΔH}_{3} - {ΔH}_{1} - {ΔH}_{2}$

${ΔH}_{soln} = {ΔH}_{1} + {ΔH}_{2} + {ΔH}_{3}$

${ΔH}_{soln} = {ΔH}_{1} - {ΔH}_{2} - {ΔH}_{3}$

${ΔH}_{soln} = {ΔH}_{1} + {ΔH}_{2} - {ΔH}_{3}$

answer is B.

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Detailed Solution

For an ideal solution, ${ΔH}_{mixing} = 0$
$ΔH = {ΔH}_{1} + {ΔH}_{2} + {ΔH}_{3}$ (According to Hess's law)
i.e., for ideal solutions, there is no change in magnitude of the attractive forces in the two components present.

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