NEET Chemistry States Of Matter MCQs Set B

Question: The compressibility of a gas is less than unity at STP. Therefore,

• a) V > 22.4 L
• b) V < 22.4 L
• c) V = 22.4 L
• d) V = 44.8 L

Answer: V < 22.4 L

Question:  When the temperature of certain sample of a gas is changed from 30°C to 606 K and its pressure is reduced to half, the volume of gas changes from V to V². The value of V is 

• a) 2 dm³
• b) 4 dm³
• c) 8 dm³
• d) Unpredictable

Answer:  4 dm³

Question:  Molar mass of certain gas A is half that of B. If rms speed of molecules of A at certain temperature is 200ms^–1. The rms speed of B at the temperature half that of A will be

• a) 200 ms^–1
• b) 100 ms^–1
• c) 300 ms^–1 
• d) 400 ms^–1

Answer:  100 ms^–1

Question:  In what ratio by mass, the gases CO and 2 butene (C₄H₈) be mixed in a vessel so that they cause same partial pressures?

• a) 1 : 1
• b) 2 : 1
• c) 1 : 2
• d) 1 : 3

Answer: 1 : 2

Question:  A sample of gas contains N₁ molecules and the total kinetic energy at –123°C is E₁ ergs. Another sample of gas at 27°C has total kinetic energy as 2E₁ ergs. Assuming gases to be ideal, the number of gas molecules in the second sample will be

• a) N₁
• b) N₁/2  
• c) 2N₁
• d) 4N₁

Answer:  N₁

Question: A gas in a vessel is heated in such a way that its pressure and volume both become two times. The temperature of the gas expressed in Kelvin scale becomes

• a) Half
• b) Becomes two times
• c) Becomes 2/3rd of its original value
• d) Becomes four times

Answer: Becomes four times

Question: At constant volume for a fixed number of a moles of a gas, the pressure of the gas increases with the rise in temperature due to

• a) Increase in average molecular speed
• b) Increase in rate of collisions amongst
• c) Increase in molecular attraction
• d) Increase in mean free path

Answer: Increase in average molecular speed

Question:  The root mean square velocity of an ideal gas at constant pressure varies with density as

• a) d²
• b) d
• c) √d
• d)

  

Answer:

Question: Which of the following has maximum number of molecules?

• a) 2.7 g of NH₃
• b) 1 L SO₂ at STP 
• c) 2 L of Cl₂ at STP
• d) 0.1 mol of H₂S

Answer:  2.7 g of NH₃

Question: The mixture of three gases X, Y and Z is enclosed in a closed vessel at constant temperature. Molecular weight of X is the highest and that of Y is the least. When equilibrium is established the

• a) Gas X will be more at bottom
• b) Gas Y will be more at top
• c) Gas X, Y, Z are homogeneously present
• d) Gas Y will be more at bottom

Answer: Gas X, Y, Z are homogeneously present

Question: Density of gaseous mixture A and B from percentage volume is given as

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: The Critical temperature, Boyle’s temperature and Inversion temperature respectively are given as

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which of the following is incorrect for pressure units?

• a) 1 atmosphere is equal to 1.01325 bar
• b) 1.01325 bar is equal to 0.875 atmosphere
• c) 1.01325 × 10⁵ Pa is equal to 1.01325 bar
• d) 1 atmosphere is equal to 1.01325 × 10⁵ kg m^–1 s^–2

Answer: 1.01325 bar is equal to 0.875 atmosphere

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

Question: For a given mass of a gas, if pressure is reduced to half and temperature is increased two times then the final volume would become (V = initial volume)

• a)

  

• b) 2V² 
• c) 6V
• d) 4V

Answer: 4V

Question: Temperature above which gas behave ideally over a wide range of pressure is called as

• a) Boyle’s temperature
• b) Inversion temperature
• c) Critical temperature
• d) Kraft temperature

Answer: Boyle’s temperature

Question: Which of the following is not correct in case of kinetic theory of gases?

• a) Gases are made up of small particles of negligible size as compared to container size
• b) The molecules are in random motion always
• c) When molecules collide they lose energy
• d) When the gas is heated, the average kinetic energy of gas molecules increase

Answer: When molecules collide they lose energy

Question: van der Waal’s constant ‘a’ and ‘b’ are related with _____ respectively

• a) Attractive force and bond energy of molecules
• b) Attractive force and volume of molecules
• c) Volume and repulsive force of molecules
• d) Shape and repulsive force of molecules

Answer: Attractive force and volume of molecules

Question:  The rate of diffusion of a gas having molecular weight just double of hydrogen gas is 30 ml s^–1. The rate of diffusion of hydrogen gas will be

• a) 42.42 ml s^–1
• b) 60 ml s^–1 
• c) 120 ml s^–1
• d) 21.21 ml s^–1

Answer:  42.42 ml s^–1

Question:   Three lines at three different values of constant pressure are given, which of the following relation is correct?

• a) P₁= P₂= P₃ 
• b) P₁> P₂> P₃
• c) P₃> P₂> P₁ 
• d) Can’t predicted

Answer:  P₁> P₂> P₃

Question:   If for the gases, the critical temperature are mentioned below i.e.,

Which of the following can be predicted?

• a) Ease of liquefaction is minimum in gas D
• b) Gas A has maximum value of van der Waal’s constant ‘a’
• c) Ease of liquefaction is directly proportional to van der Waal’s constant ‘a’
• d) All of these

Answer: All of these

Question: At high temperature and low pressure van der Waal’s equation can be expressed as

• a)

  

• b)

  

• c) P(V – b) = RT
• d) PV = RT

Answer: PV = RT

Question:  At constant volume, pressure and temperature are related as (T₀= STP temp.)

• a)

  

• b)

  

• c)

  

• d) All of these

Answer:

Question:  If the ratio of C_P and C_V  for a gas is 1.4. The number of atoms present in 11.2 litre of it at STP is

• a) 6.02 × 10²³
• b) 1.2 × 10²³
• c) 3.01 × 10²³ 
• d) 12.04 × 10²³

Answer:  6.02 × 10²³

Question: The slope of the graph between log P and log V at constant temperature for a given mass of a gas is

• a) +1
• b) –1
• c)

  

• d)

  

Answer: –1

Question:  Equal masses of H₂, O₂ and methane have been taken in a container of volume V at temperature 27°C in identical conditions. The ratio of the volumes of gases H₂: O₂: methane would be 

• a) 8:16:1
• b) 16:8:1
• c) 16:1:2
• d) 8:1:2

Answer: 16:1:2

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: HCl and He atoms

Question: Maximum deviation from ideal gas is expected from

• a) N₂(g) 
• b) CH₄(g) 
• c) NH₃(g)
• d) H₂(g)

Answer:  NH₃(g)

Question: A certain gas takes three times as long to effuse out as helium. Its molecular mass will be

• a) 27 u
• b) 36 u
• c) 64 u
• d) 9 u

Answer: 36 u

Question: By what factor does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled?

• a) 1.4
• b) 2.0
• c) 2.8
• d) 4.0

Answer: 1.4

Question: van der Waal’s real gas acts as an ideal gas, at which conditions?

• a) High temperature, low pressure
• b) Low temperature, high pressure
• c) High temperature, high pressure
• d) Low temperature, low pressure

Answer: High temperature, low pressure

Question:  Equal masses of H₂, O₂ and methane have been taken in a container of volume V at temperature 27°C in identical conditions. The ratio of the volumes of gases H₂: O₂: methane would be 

• a) 8:16:1
• b) 16:8:1
• c) 16:1:2
• d) 8:1:2

Answer: 16:1:2

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: HCl and He atoms

Question: A certain gas takes three times as long to effuse out as helium. Its molecular mass will be

• a) 27 u
• b) 36 u
• c) 64 u
• d) 9 u

Answer: 36 u

Question: By what factor does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled?

• a) 1.4
• b) 2.0
• c) 2.8
• d) 4.0

Answer: 1.4

Question: Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 seconds respectively.The molecular mass of A is 49 u. Molecular mass of B will be

• a) 25.00 u
• b) 50.00 u
• c) 12.25 u
• d) 6.50 u

Answer: 12.25 u

Question:   A gaseous mixture was prepared by taking equal mole of CO and N₂ . If the total pressure of the mixture was found 1 atmosphere, the partial pressure of the nitrogen (N₂) in the mixture is 

• a) 1 atm
• b) 0.5 atm
• c) 0.8 atm
• d) 0.98 atm

Answer: 0.5 atm

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 happen to the volume of the bubble ? 

• a) Volume will become smaller by a factor of 0.70
• b) Volume will become greater by a factor of 2.5
• c) Volume will become greater by a factor of 1.6
• d) Volume will become greater by a factor of 1.1

Answer: Volume will become greater by a factor of 1.6

Question:   The pressure exerted by 6.0 g of methane gas in a 0.03 m³ vessel at 129°C is (Atomic masses : C = 12.01, H = 1.01 and R = 8.314 JK^–1 mol^–1 ) 

• a) 215216 Pa
• b) 13409 Pa
• c) 41648 Pa
• d) 31684 Pa

Answer: 41648 Pa

Question:   A monatomic gas at pressure P₁ and volume V₁ is compressed adiabatically to 1/8 th its original volume. What is the final presssure of the gas ?

• a) 64 P₁
   
• b) P₁
• c) 16 P₁
• d) 32 P₁

Answer:  32 P₁

Question: If a gas expands at constant temperature, it indicates that

• a) Number of the molecules of gas increases
• b) Kinetic energy of molecules decreases
• c) Pressure of the gas increases
• d) Kinetic energy of molecules remains the same

Answer: Kinetic energy of molecules remains the same

Question: The surface tension of which of the following liquid is maximum?

• a) H₂O 
• b) C₆H₆
• c) CH₃OH 
• d) C₂H₅OH

Answer:  H₂O 

Question:   What is the density of N₂ gas at 227°C and 5.00 atm pressure ? (R = 0.0821 Atm K^–1 mol^–1)

• a) 0.29 g/ml
• b) 1.40 g/ml
• c) 2.81 g/ml
• d) 3.41 g/ml

Answer: 3.41 g/ml

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: 64 minutes

Question:  The temperature of a gas is raised from 27°C to 927°C. The root mean square speed of the gas

• a) Remains same
• b)

  

• c) Gets halved
• d) Gets doubled

Answer: Gets doubled

Question: An ideal gas, obeying kinetic theory of gases can not be liquefied, because

• a) It solidifies before becoming a liquid
• b) Forces acting between its molecules are negligible
• c) Its critical temperature is above 0°C
• d) Its molecules are relatively small in size

Answer: Forces acting between its molecules are negligible

Question: 0.24 g of a volatile substance, upon vapourisation, gives 45 ml vapour at NTP. What will be the vapour density of the substance?

• a) 95.93
• b) 59.73
• c) 95.39
• d) 5.993

Answer: 59.73

Question:   At 25°C and 730 mm pressure, 380 ml of dry oxygen was collected. If the temperature is constant, what volume will the oxygen occupy at 760 mm pressure?

• a) 569 ml
• b) 365 ml
• c) 265 ml
• d) 621 ml

Answer: 365 ml

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: Mass of a gas cannot be determined by weighing a container in which it is enclosed

Question: The beans are cooked earlier in pressure cooker because

• a) Boiling point increases with increasing pressure
• b) Boiling point decreases with increasing pressure
• c) Extra pressure of pressure cooker softens the beans
• d) Internal energy is not lost while cooking in pressure cooker

Answer: Boiling point increases with increasing pressure

Question: Which of the following mixture 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:  Cl₂ and SO₂

Question:   What is the dominant intermolecular force or bond that must be overcome in converting liquid CH₃OH to a gas?

• a) London dispersion force
• b) Hydrogen bonding
• c) Dipole-dipole interaction
• d) Covalent bonds

Answer: Hydrogen bonding

Question:  Average molar kinetic energy of CO and N₂ at same temperature is

• a) KE₁= KE₂
• b) KE₁> KE₂
• c) KE₁< KE₂
• d) Can’t say any thing. Both volumes are not given

Answer:  KE₁= KE₂

Question: van der Waal’s real gas acts as an ideal gas, at which conditions?

• a) High temperature, low pressure
• b) Low temperature, high pressure
• c) High temperature, high pressure
• d) Low temperature, low pressure

Answer: High temperature, low pressure

Question: van der Waal’s constant ‘a’ and ‘b’ are related with _____ respectively

• a) Attractive force and bond energy of molecules
• b) Attractive force and volume of molecules
• c) Volume and repulsive force of molecules
• d) Shape and repulsive force of molecules

Answer: Attractive force and volume of molecules

Question: Temperature above which gas behave ideally over a wide range of pressure is called as

• a) Boyle’s temperature
• b) Inversion temperature
• c) Critical temperature
• d) Kraft temperature

Answer: Boyle’s temperature

Question: The mixture of three gases X, Y and Z is enclosed in a closed vessel at constant temperature. Molecular weight of X is the highest and that of Y is the least. When equilibrium is established the

• a) Gas X will be more at bottom
• b) Gas Y will be more at top
• c) Gas X, Y, Z are homogeneously present
• d) Gas Y will be more at bottom

Answer: Gas X, Y, Z are homogeneously present

Question: At constant volume for a fixed number of a moles of a gas, the pressure of the gas increases with the rise in temperature due to

• a) Increase in average molecular speed
• b) Increase in rate of collisions amongst
• c) Increase in molecular attraction
• d) Increase in mean free path

Answer: Increase in average molecular speed

Question:   In what ratio by mass, the gases CO and 2 butene (C₄H₈) be mixed in a vessel so that they cause same partial pressures?

• a) 1 : 1
• b) 2 : 1
• c) 1 : 2
• d) 1 : 3

Answer: 1 : 2

Question: The compressibility of a gas is less than unity at STP. Therefore,

• a) V > 22.4 L
• b) V < 22.4 L
• c) V = 22.4 L
• d) V = 44.8 L

Answer: V < 22.4 L

Question: The density of gas A is twice that of gas B at the same temperature. The molecular weight of gas B is thrice that of A. The ratio of pressure acting on A and B will be

• a) 6 : 1
• b) 7 : 8
• c) 2 : 5
• d) 1 : 4

Answer: 6 : 1

Question: Solubility product principle can be applied when

• a) A solid is insoluble in a liquid
• b) A liquid is insoluble in another liquid
• c) Any ionic compound is sparingly soluble in a liquid
• d) Substance is ionic

Answer: Any ionic compound is sparingly soluble in a liquid

Question: An example of a salt dissolved in water to give acidic solution is

• a) Ammonium chloride
• b) Sodium acetate
• c) Potassium nitrate
• d) Barium bromide

Answer: Ammonium chloride