CBSE Class 11 Chemistry States of Matter MCQs Set B

Question: Which of the following is not a type of van der Waal'sforces?

• a) Ion - dipole forces
• b) London forces
• c) Dipole - induced dipole forces
• d) Dipole - dipole forces

Answer: Ion - dipole forces

Question: Who proposed the concept of dispersion force ?

• a) Fritz London
• b) van der Waal
• c) Heitler and London
• d) Gay Lussac

Answer: Fritz London

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

• a) polarisability of interacting particles
• b) strength of permanent dipoles in the particles
• c) mass of interacting particles
• d) charge of interacting particles

Answer: polarisability of interacting particles

Question: Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess ‘partial charges’. The partial charge is

• a) less than unit electronic charge
• b) double the unit electronic charge
• c) equal to unit electronic charge
• d) more than unit electronic charge

Answer: less than unit electronic charge

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

• a) only partial charges are involved
• b) only total charges are involved
• c) both
• d) None of these

Answer: only partial charges are involved

Question: Induced dipole moment depend upon the

I. dipole moment present in the permanent dipole.
II polarisability of the electrically neutral molecules.
Identify the correct option.

• a) Both I and II are correct
• b) Both I and II are wrong
• c) I is wrong and II is correct
• d) I is correct but II is wrong

Answer: Both I and II are correct

Question: Dipole-induced dipole interactions are present in which of the following pairs

• a) HCl and He atoms
• b) H₂O and alcohol
• c) Cl₂ and CCl₄
• d) None of these

Answer: HCl and He atoms

Question: Which of the following exhibits the weakest intermolecular forces ?

• a) He
• b) H₂O
• c) NH₃
• d) None of these

Answer: He

Question: Strength of the hydrogen bond is determined by interaction between the

I. lone pair of the electronegative atom and the hydrogen atom of other atom.
II. bond pair of the electronegative atom and the hydrogen atom of other atom.
Identify the correct option.

• a) Only I is correct
• b) Only II is correct
• c) Both I and II are correct
• d) Neither I nor II are correct

Answer: Only I is correct

Question: Which of the following statements regarding thermal energy is correct?

• a) All of the above
• b) Three states of matter are the result of balance between intermolecular forces and the thermal energy of the molecules
• c) Intermolecular forces tend to keep the molecules together but thermal energy of the molecules tends to  keep them apart
• d) Thermal energy is the measure of average kinetic energy of the particles of the matter and is thus responsible for movement of particles.

Answer: All of the above

More Questions..........................

Question: Which of the following is the correct order of thermal energy in three states of matter ?

• a) Solid < Liquid < Gas
• b) Liquid < Solid < Gas
• c) Liquid < Gas < Solid
• d) Gas < Solid < Liquid

Answer: Solid < Liquid < Gas

Question: Which of the following are arrangement in the correct order?

I. Gas > Liquid > Solid (Thermal energy)
II. Solid > Liquid > Gas (Intermolecular force)
Select the correct option.

• a) Both I and II
• b) I only
• c) II only
• d) None of these

Answer: Both I and II

Question: Which one of the following statements is not correct about the three states of matter i.e., solid, liquid and gaseous ?

• a) Gases like liquids possess definite volumes
• b) Molecules of a solid possess vibratory motion
• c) The density of solid is highest whereas that of gases is lowest
• d) Molecules of a solid possess least energy whereas those of a gas possess highest energy

Answer: Gases like liquids possess definite volumes

Question: Which of the following is true about gaseous state ?

• a) Thermal energy >> Molecular attraction
• b) Thermal energy << Molecular attraction
• c) Molecular force >> Those in liquids
• d) Thermal energy = Molecular attraction

Answer: Thermal energy >> Molecular attraction

Question: The first reliable measurement on properties of gases was made by

• a) Robert Boyle
• b) Gay Lussac
• c) Jacques charles
• d) Avogadro

Answer: Robert Boyle

Question: At constant temperature, for a given mass of an ideal gas

• a) the product of pressure and volume always remains constant
• b) None of these
• c) pressure always remains constant
• d) volume always remains constant

Answer: the product of pressure and volume always remains constant

Question: Boyle’s law states that the

• a) pressure of a gas is inversely proportional the volume at constant temperature
• b) volume is directly proportional to the temperature at constant pressure
• c) None of the above
• d) pressure of a gas is directly proportional to the temperature at constant volume

Answer: pressure of a gas is inversely proportional the volume at constant temperature

Question: 600 c.c. of a gas at a pressure of 750 mm of Hg is compressed to 500 c.c. Taking the temperature to remain constant, the increase in pressure, is

• a) 150 mm of Hg
• b) 350 mm of Hg
• c) 250 mm of Hg
• d) 450 mm of Hg

Answer: 150 mm of Hg

Question: The lowest hypothetical or imaginary temperature at which gases are supposed to occupy zero volume is called

• a) absolute zero
• b) constant temperature
• c) Kelvin temperature
• d) Charle's temperature

Answer: absolute zero

Question: 500 ml of nitrogen at 27°C is cooled to –5°C at the same pressure. The new volume becomes

• a) 446.66 ml
• b) 771.56 ml
• c) 326.32 ml
• d) 546.32 ml

Answer: 446.66 ml