70ᵗʰ B.P.S.C Re-Exam (Pre) 2024
For two liquids A and B to form an ideal solution
aEntropy of mixing must be zero
bFree energy of mixing should be zero
cEnthalpy of mixing should be zero✓ Correct
dNone of the above
Explanation
To obtain an ideal liquid (ideal solution) by mixing liquids A and B, the enthalpy of mixing must be zero. In an ideal solution, there is no interaction between molecules. Zero enthalpy means that during mixing, heat is neither absorbed nor released.
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