formation of a solution form two components can be considered as

(i) Pure solvent rarr separated solvent molecules, `DeltaH_(1)`

(ii) Pure solute rarr separated solute molecules, `DeltaH_(2)`

(iii) separated solvent and solute molecules rarr solution, `DeltaH_(3)`

Solution so formed will be ideal if

A. `Delta H_("soln")=Delta H_(3)-Delta H_(1)-Delta H_(2)`

B. `Delta H_("soln")=Delta H_(1)+Delta H_(2)+Delta H_(3)`

C. `Delta H_("soln")=Delta H_(1)-Delta H_(2)-Delta H_(3)`

D. `Delta H_("soln")=Delta H_(1)-Delta H_(2)-Delta H_(3)`