Chemistry Exam > Chemistry Questions > Select correct statement?a)Heats of vaporizat...
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Select correct statement?
- a)Heats of vaporization for a pure solvent and for a solution are similar because similar intermolecular forces between solvent molecules must be overcome in both cases.
- b)Entropy change between solution and vapour is smaller than the entropy change between pure solvent and vapour.
- c)Boiling point of the solution is larger than that of the pure solvent.
- d)All are correct statements.
Correct answer is option 'D'. Can you explain this answer?
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Select correct statement?a)Heats of vaporization for a pure solvent an...
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- d)All are correct statements.
option (a) is also a a correct statement because the heats of vaporization of pure solvent and solution are similar because similar forces of attraction must be overcome so that
the solvent molecules can break free from the surface and escape as vapours.
Entropy change between solution and vapour is smaller than the entropy change between pure solvent and vapour. Boiling point of the solution is larger than that of the pure solvent.
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Select correct statement?a)Heats of vaporization for a pure solvent an...
Explanation:
The correct statement is option D, which states that all the statements are correct. Let's go through each statement one by one to understand why they are correct.
a) Heats of vaporization for a pure solvent and for a solution are similar because similar intermolecular forces between solvent molecules must be overcome in both cases:
This statement is correct. The heat of vaporization is the amount of heat energy required to convert a liquid into its vapor phase at a given temperature and pressure. In both cases, whether it is a pure solvent or a solution, the intermolecular forces between the solvent molecules must be overcome to vaporize the liquid. These intermolecular forces are similar in both cases, hence the heats of vaporization for a pure solvent and for a solution are similar.
b) Entropy change between solution and vapor is smaller than the entropy change between pure solvent and vapor:
This statement is correct. Entropy is a measure of the randomness or disorder in a system. When a liquid vaporizes, its entropy increases as the molecules go from a more ordered liquid phase to a more disordered vapor phase. However, when a solute is dissolved in a solvent to form a solution, the randomness or disorder in the system decreases. Therefore, the entropy change between the solution and vapor is smaller compared to the entropy change between the pure solvent and vapor.
c) Boiling point of the solution is larger than that of the pure solvent:
This statement is correct. When a solute is dissolved in a solvent, the boiling point of the solution increases compared to that of the pure solvent. This is because the presence of solute particles disrupts the crystal lattice of the solvent, making it more difficult for the solvent molecules to escape into the vapor phase. As a result, a higher temperature is required to reach the boiling point of the solution.
In conclusion, all the statements (a, b, and c) are correct. The heats of vaporization for a pure solvent and for a solution are similar, the entropy change between solution and vapor is smaller than the entropy change between pure solvent and vapor, and the boiling point of the solution is larger than that of the pure solvent.
The correct statement is option D, which states that all the statements are correct. Let's go through each statement one by one to understand why they are correct.
a) Heats of vaporization for a pure solvent and for a solution are similar because similar intermolecular forces between solvent molecules must be overcome in both cases:
This statement is correct. The heat of vaporization is the amount of heat energy required to convert a liquid into its vapor phase at a given temperature and pressure. In both cases, whether it is a pure solvent or a solution, the intermolecular forces between the solvent molecules must be overcome to vaporize the liquid. These intermolecular forces are similar in both cases, hence the heats of vaporization for a pure solvent and for a solution are similar.
b) Entropy change between solution and vapor is smaller than the entropy change between pure solvent and vapor:
This statement is correct. Entropy is a measure of the randomness or disorder in a system. When a liquid vaporizes, its entropy increases as the molecules go from a more ordered liquid phase to a more disordered vapor phase. However, when a solute is dissolved in a solvent to form a solution, the randomness or disorder in the system decreases. Therefore, the entropy change between the solution and vapor is smaller compared to the entropy change between the pure solvent and vapor.
c) Boiling point of the solution is larger than that of the pure solvent:
This statement is correct. When a solute is dissolved in a solvent, the boiling point of the solution increases compared to that of the pure solvent. This is because the presence of solute particles disrupts the crystal lattice of the solvent, making it more difficult for the solvent molecules to escape into the vapor phase. As a result, a higher temperature is required to reach the boiling point of the solution.
In conclusion, all the statements (a, b, and c) are correct. The heats of vaporization for a pure solvent and for a solution are similar, the entropy change between solution and vapor is smaller than the entropy change between pure solvent and vapor, and the boiling point of the solution is larger than that of the pure solvent.
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Select correct statement?a)Heats of vaporization for a pure solvent and for a solution are similar because similar intermolecular forces between solvent molecules must be overcome in both cases.b)Entropy change between solution and vapour is smaller than the entropy change between pure solvent and vapour.c)Boiling point of the solution is larger than that of the pure solvent.d)All are correct statements.Correct answer is option 'D'. Can you explain this answer?
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