An azeotropic mixture of two liquids boils at a lower temperature than...
If a mixture boils at lower temp compared to constituent liquids a, b tht means it has lower boiling point than both the liquids ....leaves us with the case of minimum total boiling point and as boiling point is inversely proportional to vapour presssure . tht means experimental Vapour pressure was observed to be higher than so suppposed from roults law tht means says its a positive deviation Pt> P•a+P•b
thts it.
An azeotropic mixture of two liquids boils at a lower temperature than...
Explanation:
An azeotropic mixture is a mixture of two or more liquids that has a constant boiling point and composition. It means that the vapor produced during boiling has the same composition as the liquid mixture. Azeotropic mixtures can show either positive or negative deviation from Raoult's law.
Positive Deviation from Raoult's Law:
When an azeotropic mixture shows positive deviation from Raoult's law, it means that the vapor pressure of the mixture is higher than that predicted by Raoult's law. In other words, the components of the mixture have a stronger attraction for each other than for themselves. As a result, the vapor pressure of the mixture is higher and it boils at a higher temperature than either of the pure components.
For example, in a positive azeotropic mixture, the components A and B have a stronger attraction for each other, forming stronger intermolecular forces. This leads to a higher boiling point for the mixture compared to the boiling points of pure A and B.
Negative Deviation from Raoult's Law:
When an azeotropic mixture shows negative deviation from Raoult's law, it means that the vapor pressure of the mixture is lower than that predicted by Raoult's law. In other words, the components of the mixture have a weaker attraction for each other than for themselves. As a result, the vapor pressure of the mixture is lower and it boils at a lower temperature than either of the pure components.
For example, in a negative azeotropic mixture, the components A and B have a weaker attraction for each other. This weakens the intermolecular forces and reduces the boiling point of the mixture compared to the boiling points of pure A and B.
Answer:
In the given question, it is stated that the azeotropic mixture of two liquids boils at a lower temperature than either of these when it shows positive deviation from Raoult's law. This means that the components of the mixture have a weaker attraction for each other than for themselves.
Hence, option 'B' is the correct answer.
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