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17. Formation of a solution from two components can be considered as

i.  Pure  solvent  →   separated  solvent molecules  ΔH1

ii. Pure solvent  →   separated  solvent molecules  ΔH2

iii. Separated solvent and solute molecules → solution ΔH3

Solution so formed will be ideal if

a. ΔHsoln  = ΔH3  – ΔH1  – ΔH2

b. ΔHsoln  = ΔH1  – ΔH2  – ΔH3

c. ΔHsoln  = ΔH1   + ΔH2  – ΔH3

d. ΔHsoln  = ΔH1 – ΔH2  – ΔH3

Answer. b

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