CBSE Class 11 Chemistry States of Matter MCQs Set B

Question: A bubble of air is underwater at temperature 15°C and the pressure 1.5 bar. If the bubble rises to the surface where the temperature is 25°C and the pressure is 1.0 bar, what will appen to the volume of the bubble?
a) Volume will become greater by a factor of 1.6.
b) Volume will become greater by a factor of 1.1.
c) Volume will become smaller by a factor of 0.70.
d) Volume will become greater by a factor of 2.5.
Answer: a

Question: A gaseous mixture was prepared by taking equal oles of CO and N₂. If the total pressure of the mixture was found 1 atmosphere, the partial pressure of the nitrogen (N₂) in the ixture is
a) 0.5 atm
b) 0.8 atm
c) 0.9 atm
d) 1 atm 
Answer: a

Question: Dipole-induced dipole interactions are present in which of the following pairs?
a) HCl and He atoms
b) SiF₄ and He atoms
c) H₂O and alcohol
d) Cl₂ and CCl₄
Answer: a

Question: Which one of the following is the correct order ofinteractions?
a) Covalent < hydrogen bonding < van der Waals’ < dipole-dipole
b) van der Waals’ < hydrogen bonding < dipoledipole < covalent
c) van der Waals’ < dipole-dipole < hydrogen bonding < covalent
d) Dipole-dipole < van der Waals’ < hydrogen bonding < covalent.
Answer: b

Question: A mixture of N₂ and Ar gases in a cylinder contains 7 g of N₂ and 8 g of Ar. If the total pressure of the mixture of the gases in the cylinder is 27 bar, the partial pressure of N₂ is [Use tomic masses (in g mol^–1) : N = 14, Ar = 40]
a) 9 bar
b) 12 bar
c) 15 bar
d) 18 bar.
Answer: c

Question: Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess ‘partial charges’. The partial charge is
a) more than unit electronic charge
b) equal to unit electronic charge
c) less than unit electronic charge
d) double the unit electronic charge
Answer: c

Question: What is the density of N₂ gas at 227°C and 5.00 atm pressure? (R = 0.082 L atm K^–1mol^–1)
a) 1.40 g/mL
b) 2.81 g/mL
c) 3.41 g/mL
d) 0.29 g/mL
Answer: c

Question: 50 mL of each gas A and of gas B takes 150 and 200 seconds respectively for effusing through a pin holeunder the similar conditions. If molecular mass of gas B is 36, the olecular ass of gas A will be
a) 96
b) 128
c) 32
d) None of the options
Answer: d

Question: Under what conditions will a pure sample of an ideal gas not only exhibit a pressure of 1 atm but also a concentration of 1 mole litre^–1? (R = 0.082 litre atm mol^–1 deg–1)
a) At STP
b) When V = 22.4 litres
c) When T = 12 K
d) Impossible under any conditions
Answer: c

Question: A certain gas takes three times as long to effuse out as helium. Its molecular mass will be 5 States of Matter
a) 27 u
b) 36 u
c) 64 u
d) 9 u 
Answer: b

Question: Dipole-induced dipole interactions are present in which of the following pairs :
a) Cl₂ and CCl₄
b) HCl and He atoms
c) SiF₄ and He atoms
d) H₂O and alcohol
Answer: d

Question: The correct value of the gas constant ‘R’ is close to
a) 0.082 litre-atmosphere K
b) 0.082 litre-atmosphere K^–1 mol^–1
c) 0.082 litre-atmosphere^–1 K mol^–1
d) 0.082 litre^–1 atmosphere^–1 K mol. 
Answer: b

Question: The volume occupied by 1.8 g of water vapour at 374°C and 1 bar pressure will be [Use R = 0.083 bar L K^–1mol^–1]
a) 96.66 L
b) 55.87 L
c) 3.10 L
d) 5.37 L
Answer: d

Question: Which of the following statements is wrong for gases?
a) Confined gas exerts uniform pressure on the walls of its container in all directions.
b) Volume of the gas is equal to volume of container confining the gas.
c) Gases do not have a definite shape and volume.
d) Mass of a gas cannot be determined by weighing a container in which it is enclosed.
Answer: d

Question: Pressure remaining the same, the volume of a given mass of an ideal gas increases for every degree centrigrade rise in temperature by definite fraction of its volume at
a) 0°C
b) its critical temperature
c) absolute zero
d) its Boyle temperature.
Answer: a

Question: Which of the following mixtures of gases does not obey Dalton’s law of partial pressure?
a) Cl₂ and SO₂
b) CO₂ and He
c) O₂ and CO₂
d) N₂ and O₂ 
Answer: a

Question: Which of the following exhibits the weakest intermolecular forces ?
a) NH₃
b) HCl
c) He
d) H₂O
Answer: c

Question: At what temperature, the rate of effusion of N₂ would be 1.625 times than the rate of SO₂ at 50°C?
a) 373°C
b) 620°C
c) 100°C
d) 173°C
Answer: c

Question: 50 mL of hydrogen diffuses out through a small hole of a vessel, in 20 minutes. The time taken by 40 mL of oxygen to diffuse out is
a) 32 minutes
b) 64 minutes
c) 8 minutes
d) 12 minutes
Answer: b

Question: Maximum deviation from ideal gas is expected from
a) CH₄(g)
b) NH₃(g)
c) H₂(g)
d) N₂(g)
Answer: b