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Q. No.Considering the formation, breaking and strength of hydrogen bond, predict which of the following mixtures will show a positive deviation from Raoult’s law?
1. Methanol and acetone
2. Chloroform and acetone
3. Nitric acid and water
4. Phenol and aniline
On the basis of the information given below, mark the correct option.
| i. | In a bromoethane and chloroethane mixture, intermolecular interactions of A—A and B—B type are nearly the same as A—B type interactions. |
| ii. | In an ethanol and acetone mixture, A—A or B—B type intermolecular interactions are stronger than A—B type interactions. |
| iii. | In a chloroform and acetone mixture, A—A or B—B type intermolecular interactions are weaker than A—B type interactions. |
1. Solutions (ii) and (iii) will follow Raoult’s law
2. Solution (i) will follow Raoult’s law
3. Solution (ii) will show negative deviation from Raoult’s law
4. Solution (iii) will show positive deviation from Raoult’s law
If two liquids A and B form minimum boiling azeotrope at some specific composition then:
| 1. | A—B interactions are stronger than those between A—A or B—B |
| 2. | Vapour pressure of solution increases because more number of molecules of liquids A and B can escape from the solution |
| 3. | Vapour pressure of solution decreases because less number of molecules of only one of the liquids escape from the solution |
| 4. | A—B interactions are weaker than those between A—A or B—B |
Some hydrogen bonds between methanol molecules are disrupted after adding acetone to methanol.
Select the appropriate option:
| 1. | At specific compositions, a methanol-acetone mixture will form a minimum boiling azeotrope and show a positive deviation from Raoult’s law. |
| 2. | At specific compositions, a methanol-acetone mixture will form a maximum boiling azeotrope and show a positive deviation from Raoult’s law. |
| 3. | At specific compositions, a methanol-acetone mixture will form a minimum boiling azeotrope and show a negative deviation from Raoult’s law. |
| 4. | At specific compositions, a methanol-acetone mixture will form maximum boiling azeotrope and show a negative deviation from Raoult’s law. |
The intermolecular forces between benzene molecules are approximately equal in strength to those between toluene molecules. For a benzene + toluene mixture, identify the incorrect statement(s):
| (a) | ΔHmix= Zero |
| (b) | ΔVmix = Zero |
| (c) | The mixture forms a minimum-boiling azeotrope |
| (d) | The mixture does not behave as an ideal solution |
Which option lists the incorrect statements?
| 1. | a and b | 2. | b and c |
| 3. | c and d | 4. | a and d |
Which of the following binary mixtures will have the same composition in the liquid and vapour phase?
| (a) | Benzene-toluene | (b) | Water-nitric acid |
| (c) | Water-ethanol | (d) | n-Hexane-n-heptane |
The correct choice is:
| 1. | a and b | 2. | b and c |
| 3. | c and d | 4. | a and d |
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Q. No.
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