Class 11 States of Matter MCQs With Answer

Class 11 chemistry MCQs with answers are provided here for the chapter States of Matter. These MCQs are based on the CBSE board curriculum and correspond to the most recent Class 11 chemistry syllabus. By practising these Class 11 Multiple choice questions, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 11 Annual examinations as well as other entrance exams such as NEET and JEE.

Class 11 Chemistry States of Matter MCQs With Answer

Q1. Thermal energy is directly proportional to the:

1. Volume of the substance.
2. Mass of the substance.
3. Temperature of the substance.
4. Both (a) and (b)

Q2. Dipole-dipole interaction is stronger than the London forces but is weaker than ion-ion interaction because:

1. Only partial charges are involved.
2. Total charges are involved.
3. Charge of more electronegative part is involve.
4. None of the above.

Q3. Which of the following property of water can be used to explain the spherical shape of rain droplets?

1. Viscosity.
2. Surface tension.
3. Critical phenomena.
4. Pressure.

Q5. How does the surface tension of a liquid vary with increase in temperature?

1. Remains same.
2. Decreases.
3. Increases.
4. No regular pattern is followed.

Q6. The condition of free vaporisation throughout the liquid is called:

1. Boiling.
2. Melting.
3. Freezing.
4. Condensation

Q7. The interaction energy of London force is inversely proportional to sixth power of the distance between two
interacting particles but their magnitude depends upon:

1. Charge of interacting particles.
2. Mass of interacting particles.
3. Polarisability of interacting particles.
4. Strength of permanent dipoles in the particles.

Q8. What will be the minimum pressure required to compress 2L of gas at 1bar to 1L at 25°C?

1. 1bar
2. 2bar
3. 4bar
4. 6bar

Q9. ‘At constant temperature, the pressure of a fixed amount of gas varies inversely with its volume’. This law is
known as:

1. Charle’s law.
2. Boyle’s law.
3. Gay Lussac’s law.
4. Dalton’s law

Q10. As the temperature increases, average kinetic energy of molecules increases. What would be the effect of
increase of temperature on pressure provided the volume is constant?

1. Increases.
2. Decreases.
3. Remains same.
4. Becomes half.

Q11. Which of the following statements is correct?

1. Evaporation occurs only at the surface.
2. Evaporation takes place at all temperatures.
3. Both (a) and (b) are correct.
4. None of the above.

Q12. In kinetic molecular theory, it is assumed that average kinetic energy of the gaseous molecules is directly
proportional to the:

1. Absolute pressure.
2. Absolute volume.
3. Absolute temperature.
4. None of these.

Q13. The total energy of the gaseous molecules before and after the collision remains same because:

1. Collisions of gaseous molecules are perfectly elastic.
2. Gases are highly compressible.
3. Both (a) and (b).
4. None of the above.

Q14. London or dispersion force is a/ an:

1. Attractive force that acts between two temporary dipoles.
2. Attractive force that acts between two permanent dipoles.
3. Repulsive force that acts between two permanent dipoles.
4. Repulsive force that acts between two temporary dipoles.

Q15. The energy required to increase the surface area of the liquid by one unit is defined as:

1. Surface energy.
2. Potential energy.
3. Free energy.
4. Molecular energy.

Q16. The negative deviation from ideal behaviour means that the:

1. Value of pV decreases with decrease in pressure.
2. Value of pV decreases with increase in pressure.
3. Value of pV increases with increase in pressure.
4. Value of pV remains constant with increase in pressure.

Q17. Maximum deviation from ideal gas is expected from:

1. CH₄
2. NH₃
3. H₂
4. N₂

Q18. The type of attractive forces operating between the polar molecules having permanent dipole and the molecules
lacking permanent dipole is:

1. Dipole-dipole.
2. London forces.
3. Dipole-induced dipole.
4. H-bonding.

Q19. At 1atm pressure the boiling temperature is called normal boiling point and if pressure is 1bar then the boiling
point of the liquid is called:

1. Normal boiling point.
2. Standard boiling point.
3. Critical boiling point.
4. None of the above.

Q20. Which of the following changes decrease the vapour pressure of water kept in a sealed vessel?

1. Decreasing the quantity of water.
2. Adding salt to water.
3. Decreasing the volume of the vessel to one-half.
4. Decreasing the temperature of water.

Q21. Under which of the following two conditions applied together, a gas deviates most from the ideal behaviour

1. Low pressure.
2. High pressure.
3. Low temperature.
4. High temperature.

Q22. The force acting per unit length perpendicular to the line drawn on the surface of liquid and its SI unit
respectively are:

1. Gravitational force, Newton.
2. Surface tension, Nm .
3. Surface energy, Joule.
4. None of the above.

Q23. Which of the following statements indicates that law of multiple proportion is being followed.

1. Sample of carbon dioxide taken from any source will always have carbon and oxygen in the ratio 1 : 2.
2. Carbon forms two oxides namely CO and CO, where masses of oxygen which combine with fixed mass of
   carbon are in the simple ratio 2 : 1.
3. When magnesium burns in oxygen, the amount of magnesium taken for the reaction is equal to the amount
   of magnesium in magnesium oxide formed.
4. At constant temperature and pressure 200mL of hydrogen will combine with 100mL oxygen to produce
   200mL of water vapour.

Q24. “The total pressure exerted by the mixture of non-reactive gases is equal to the sum of the partial pressures of
individual gases”. Above statement represents the:

1. Dalton’s law of partial pressure.
2. Avogadro’s law.
3. Graham’s law of diffusion.
4. None of the above.

Q25. The value of Z for real gases below Boyle’s temperature initially:

1. Increases.
2. Decreases.
3. Remain same.
4. Increases then decreases

Q26. If the ratio of masses of SO and O gases confined in a vessel is 1 : 1, then the ratio of their partial pressure
would be:

1. 5 : 2
2. 2 : 5
3. 2 : 1
4. 1 : 2

Q27. Which of the following is a correct statement?

1. Surface tension of a liquid decreases with increase in temperature.
2. Vapour pressure of a liquid decreases with increase in temperature.
3. Viscosity of a liquid decreases with decrease in temperature.
4. In gravity free environments, droplets of a liquid on flat surface are slightly flattened.

Q28. The strong intermolecular forces between molecules hold them together and resist the movement of layers past
one another. This property of liquid is called:

1. Surface tension.
2. Viscosity.
3. Relative velocity.
4. Critical volume.

Q29. A person living in Shimla observed that cooking food without using pressure cooker takes more time. The reason
for this observation is that at high altitude:

1. Pressure increases.
2. Temperature decreases.
3. Pressure decreases.
4. Temperature increases.

Q30. Increase in kinetic energy can overcome intermolecular forces of attraction. How will the viscosity of liquid be
affected by the increase in temperature?

1. Increase.
2. No effect.
3. Decrease.
4. No regular pattern will be followed.