States of Matter
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MCQs:
5.28. The average kinetic energy of the gas molecule is
(a) Inversely proportional to its absolute temperature
(b) Directly proportional to its absolute temperature
(c) Equal to the square of its absolute temperature
(d) All of the above
MCQs:
5.28. The average kinetic energy of the gas molecule is
(a) Inversely proportional to its absolute temperature
(b) Directly proportional to its absolute temperature
(c) Equal to the square of its absolute temperature
(d) All of the above
5.28. (b) directly proportional to its absolute temperature
Upvote 
5.27. Assertion: At high altitudes, liquids boil at lower temperatures in comparison to that at sea level.
Reason: At high altitudes atmospheric pressure is high.
5.27. Assertion: At high altitudes, liquids boil at lower temperatures in comparison to that at sea level.
Reason: At high altitudes atmospheric pressure is high.
5.27. (c) At high altitudes atmospheric pressure is low. Therefore, liquids at high altitudes boil at lower temperatures in comparison to that at sea level. Since water boils at low temperature on hills, the pressure cooker is used for cooking food. In hospitals surgical instruments are steril
Upvote 5.26. Assertion: Intermolecular interactions may hold the closely and slowly moving molecules together and thus the solid liquifies.
Reason: Compression brings the molecules in close vicinity and cooling slows down the movement of molecules.
5.26. Assertion: Intermolecular interactions may hold the closely and slowly moving molecules together and thus the solid liquifies.
Reason: Compression brings the molecules in close vicinity and cooling slows down the movement of molecules.
5.26. (d) Compression brings the molecules in close vicinity and cooling slows down the movement of molecules therefore, intermolecular interactions may hold the closely and slowly moving molecules together and the gas liquifies.
Upvote 5.25. Assertion: Liquids and solids are hard to compress.
Reason: Magnitude of the repulsion rises very rapidly as the distance separating the molecules decreases.
5.25. Assertion: Liquids and solids are hard to compress.
Reason: Magnitude of the repulsion rises very rapidly as the distance separating the molecules decreases.
5.25. (a) Other than attractive forces, molecules also exert repulsive forces on one another. When two molecules are brought into close contact with each other, the repulsion between the electron clouds and that between the nuclei of two molecules comes into play. Magnitude of the repulsion ri
Upvote 5.24. Assertion: Viscosity of liquids decreases as the temperature rises.
Reason: Molecules of liquids are held together by attractive intermolecular forces.
5.24. Assertion: Viscosity of liquids decreases as the temperature rises.
Reason: Molecules of liquids are held together by attractive intermolecular forces.
5.24. (b) Viscosity of liquids decreases as the temperature rises because at high temperature molecules have high kinetic energy and can overcome the intermolecular forces to slip past one another between the layers.
Upvote Assertion and Reason:
Directions:
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
5.23. Assertion: The dipole-dipole interactionbetween two HCl moleculesis stronger than the London forces.
Reason: Only partial charges are involved
Assertion and Reason:
Directions:
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
5.23. Assertion: The dipole-dipole interactionbetween two HCl moleculesis stronger than the London forces.
Reason: Only partial charges are involved
5.23. (a) The dipole-dipole interaction between two HCl molecules is stronger than the London forces but is weaker than ion-ion interaction because only partial charges are involved.
Upvote 5.22. Critical temperature for CO2 and CH4 are 31.1°C and -81.9°C respectively. Which of these has stronger intermolecular forces and why?
5.22. Critical temperature for CO2 and CH4 are 31.1°C and -81.9°C respectively. Which of these has stronger intermolecular forces and why?
5.22. Higher the critical temperature, more easily the gas can be liquefied, i.e., greater are the intermolecular forces of attraction. Hence, CO2 has stronger intermolecular forces than CH4.
Upvote