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Non-ideal solutions exhibit either positive or negative deviations from Raoult's law. What arethese deviations and why are they caused ? Explain with one example for each type. |
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Answer» Solution : POSITIVE deviations : In this type of solutions, the total vapour pressure is more than that expectedfrom Raoult.s law, `DELTA V_( mix)` and `Delta H_( mix)`are always positive. Examples : acetone + benzene, ETHYL ALCOHOL + chloroform. Negative deviations : In this type of solutions, total pressure for any mole fraction is less than that according to Raoult.s law. For such solutions, `Delta V_(mix)` and `DeltaH_(mix)`are negative. Examples : benzene + chloroform, water + sulphuric acid. |
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