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CBSE Questions for Class 11 Medical Chemistry States Of Matter Gases And Liquids Quiz 4 - MCQExams.com

Ptotal=P1+P2+P3+.... which of the following is correct about the expression?
  • Boyle's law
  • Charle's law
  • Ideal gas equation
  • Combined gas law
  • Dalton's law of partial pressures
Which of the following will diffuse faster than the others?
  • Water
  • Petrol
  • Perfume
  • Milk
A gas is confined in the manometer as shown below. The stopcock is then opened and the highest level of mercury inside the tube moved to a level that is 80 mm above its lowest level. What is the pressure of the gas? 
487483_b42e383f2d9443fa9991788594fb021c.png
  • 80 mmHg
  • 160 mmHg
  • 680 mmHg
  • 840 mmHg
  • Cannot be determined
Which of the following pair of gases cannot be separated by diffusion method?
  • SO2 and H2
  • CO2 and N2O
  • NH3 and N2
  • CO2 and H2
Statement I
The volume of a gas at 100 deg C and 600 mmHg will be lower at STP
Because
Statement II
Decreasing temperature and increasing pressure will cause the volume of a gas to decrease
  • Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1
  • Both the Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.
  • Statement 1 is correct but Statement 2 is not correct.
  • Statement 1 is not correct but Statement 2 is correct.
  • Both the Statement 1 and Statement 2 are not correct.
All gases have the same number of moles in the same volume at constant T and P is stated by :
  • Boyle's law
  • Charle's law
  • Avogardro's law
  • ideal gas law
  • Dalton's law
The total pressure of a gaseous mixture is equalto the sum of the partial pressures is:
  • Boyles law
  • Charles law
  • Avogadro's law
  • Ideal gas law
  • Daltons law
Which shows increasing the kinetic energy of a liquid?
495064.png
  • AB
  • BC
  • CD
  • DE
  • EF
Calculate the number of iron atoms in a piece of iron weighing 2.8g. (Atomic mass of iron =56)
  • 30.11×1023 atoms
  • 3.11×1023 atoms
  • 3.0115×1022 atoms
  • 301.1×1023 atoms
Gay Lussac's Law of combining volumes is applicable for combustion of carbon.
  • True
  • False
64 g of sulphur dioxide occupies 22.4 L volume at STP.
  • True
  • False
The value of the Avogadro constant is:
  • 6.022×1013
  • 6.022×1022
  • 6.022×1023
  • 6.022×1024
Which statement is NOT compatible with the ideal gas law?
  • Gas particles have no definite volume
  • Gas temperature depends on particles mass and velocity
  • Gas particles are in constant, random motion
  • Gas particles have no mass
Statement I: In the kinetic theory of gases, collisions between gas particles and the walls of the container are considered elastic.
Statement II: Gas molecules are considered pointlike, volumeless particles with no intermolecular forces and in constant, random motion.
  • Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1
  • Both the Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1
  • Statement 1 is correct but Statement 2 is not correct
  • Statement 1 is not correct but Statement 2 is correct
  • Both the Statement 1 and Statement 2 are not correct
Which of the following is a possible source of error in the results of this experiment?
524223_36298f57589f4772952ec05e1b2c5e37.png
  • Inaccurate weighing of the isopropanol
  • The presence of bits of broken glass in the flask
  • Failure to correct for humidity
  • Misreading of the atmospheric pressure
Two gases A and B are taken in same volume containers under similar conditions of temperature and pressure. In container A, there are '2N' molecules of gas A. How many number molecules does container B have? 
  • 2N
  • 4N
  • N
  • 8N
At constant temperature, the behavior of a real gas more closely approximates that of an ideal as its volume increases due to which of the following?
  • The average molecular kinetic energy decreases.
  • The molecules have expanded.
  • The average molecular speed decreases.
  • The average distance between the molecules becomes greater.
If the gas particles in a rigid container slow down, what will happen to the pressure inside the container?
  • Pressure will increase
  • Pressure will decrease
  • Pressure will oscillate
  • Pressure will not change
The initial pressure inside the flask is:
524221_18c042995fb147b9a377600f147d827d.png
  • near zero (vacuum)
  • 27 mm Hg
  • 760 mm Hg
  • (76027) mm Hg

Just because you mix two things together does not necessarily mean they will form a homogeneous mixture (a solution). For example, if you add sodium chloride, NaCl, to a container that has both hexane and water, the NaCl will dissolve into the water, but will not be found in the hexane C6H14.
Which of the following statement BEST explains these observations?
  • Polar water molecules form ion-dipole forces with the ions of NaCl. Hexane, being nonpolar, cannot form these ion-dipole interactions.
  • Nonpolar hexane molecules tend to repel the ions that make up NaCl.
  • Nonpolar hexane is less dense that water, so when the two are in the same container, any NaCl that is added to the mixture sinks to the bottom of the container and cannot get into the hexane layer.
  • Nonpolar hexane molecules and water molecules repel one another.
An experiment is conducted where droplets of liquid are placed on the surface of a penny. Which of the following substances would you expect to the able to place the maximum number of drops of on the surface of the penny?
  • HF
  • H2O
  • CH3CH2CHO
  • CCl4
The mass of a non-volatile solute of molar mass 40 g mol1 that should be dissolved in 114 g of octane to lower its vapour pressure by 20% is :
  • 10 g
  • 11.4 g
  • 9.8 g
  • 12.8 g
When applied to law of combining volumes, which of the following is correct about Berzelius hypothesis ?
a) it predicts atoms are indivisible
b)it predicts atoms are divisible
c)it is contrary to Dalton's hypothesis
  • Only a
  • Only b
  • Both a and c
  • Both b and c
For a non-volatile solute:
  • vapour pressure of solution is more than vapour pressure of solvent
  • vapour pressure of solvent is zero
  • vapour pressure of solute is zero
  • all of the above
In the reaction, N2+3H22NH3, the ratio of volumes of nitrogen, hydrogen and ammonia is 1 : 3:These figures illustrate the law of: 
  • constant proportions
  • Gay-Lussac
  • multiple proportions
  • reciprocal proportions
The ideal gas law was first stated by:
  • Robert Boyle
  • Jacques Charles
  • Amedeo Avagadro
  • Emile Clapeyron
Which of the following law is followed by ideal gases?
  • Charle's law
  • Boyle's law
  • Avogadro's law
  • All of the above
The vapour pressure of pure benzene at 88oC is 957 mm and that of toluene at the same temperature is 379.5 mm. Calculate the composition of benzene-toluene mixture boiling at 88oC.
  • xbenzene=0.66;xtoluene=0.34
  • xbenzene=0.34;xtoluene=0.66
  • xbenzene=xtoluene=0.5
  • xbenzene=0.75;xtoluene=0.25
The specific heat of a bivalent metal is 0.The approximate equivalent mass of the metal will be:
  • 40
  • 20
  • 80
  • 10
Four flasks of 1 litre capacity each arc separately filled with gases H2,He,O2 and O3. At the same temperature and pressure the ratio of the number of atoms of these gases present in different flasks would be: 
  • 1 : 1 : 1 : 1
  • 2 : 1 : 2 : 3
  • 1 : 2 : 1 : 3
  • 3 : 2 : 2 : 1
Which of the following are correct for an ideal gas?
  • (UV)T=0
  • (HP)T=0
  • (TP)H=0
  • (PT)H=0
Vapour pressure of pure A(p0A)=100 mm Hg
Vapour pressure of pure B(p0B)=150 mm Hg

2 mole of liquid A and 3 mole of liquid B are mixed to form an ideal solution. The vapour pressure of the solution will be :
  • 135 mm
  • 130 mm
  • 140 mm
  • 145 mm
At 25oC, the vapour pressure of pure benzene is 100 torr, while that of pure ethyl alcohol is 44 torr. Assuming ideal behaviour, calculate the vapour pressure at 25oC of a solution which contains 10 g of each substance.
  • 33.775 torr
  • 54.775 torr
  • 64.775 torr
  • 60.775 torr
At 25oC, the total pressure of an ideal solution obtained by mixing 3 mole of A and 2 mole of B, is 184 torr. What is the vapour pressure (in torr) of pure B at the same temperature (Vapour pressure of pure A at 25oC is 200 torr.)?
  • 180
  • 160
  • 16
  • 100
Equal volumes of different gases at any definite temperature and pressure have:
  • equal weights
  • equal masses
  • equal densities
  • equal number of moles
Mole fraction of the component A in vapour phase is x1 and mole fraction of component A in liquid mixture is x2, then (p0A= vapour pressure of pure A; p0B= vapour pressure of pure B), the total vapour pressure of liquid mixture is :
  • p0Ax2x1
  • p0Ax1x2
  • p0Bx1x2
  • p0Bx2x1
If the concentration of water vapour in the air is 1% and the total atmospheric pressure equals 1atm then the partial pressure of water vapour is?
  • 0.1 atm
  • 1 mm Hg
  • 7.6 mm Hg
  • 100 atm
The following graphs illustrate: 
667491_7f8051aff01e4c1ea89d2564e5a42584.png
  • Dalton's law
  • Boyle's law
  • Charles' law
  • Gay-Lussac's law
The temperature, at which the density of O2 at 1 atm, is the same as that of CH4 at S.T.P is:
  • 273C
  • 100C
  • 546C
  • 150C
What is the vapour pressure of a solution of glucose which has an osmotic pressure of 3 atmospheres at 20C? The vapour pressure of water at 20oC is 17.39mm. Consider the density of solution equal to that of the solvent.
  • 12.35mm
  • 14.35mm
  • 16.35mm
  • 17.35mm
At a constant temperature, which of the following aqueous solutions will have the maximum vapour pressure?

[Mol weight: NaCl=58.5,H2SO4=98.0g.mol1]
  • 1 molal NaCl
  • 1 molar NaCl
  • 1 molal H2SO4
  • 1 molar H2SO4
Which of the following do not pertain to the postulates of kinetic theory of gases?
  • The gas molecules are perfectly elastic
  • Speed of gas molecules are every changing
  • Pressure exerted by the gas is due to the collision of molecules with the walls of the container
  • Kinetic energy of a gas is given by the sum of 273 and temperature in Celsius scale
Plot of Maxwell's distribution of velocities is given below:
which of following is correct?
654454_eb65a8304fc646848f5db3cffddaa3ec.png
  • T1>T2
  • T1<T2
  • v1<v2
  • f1>f2
Which of the following property indicates weak intermolecular forces of attraction in liquid?
  • High heat of vaporization
  • High vapour pressure
  • High critical temperature
  • High boiling point
At 27C a sample of ammonia gas exerts a pressure of 5.3 atm. What is the pressure when the volume of the gas is reduced to one-tenth of the original value at the same temperature?
  • 0.53 atm
  • 5.3 atm
  • 53 atm
  • None of these
Equal weights of two gases of molecular weight 4 and 40 are mixed. The pressure of the mixture is 1.1 atm. The partial pressure of the light gas in this mixture is :
  • 0.55 atm
  • 0.15 atm
  • 1 atm
  • 0.11 atm
On the surface of the earth at 1 atm pressure, a balloon filled with H2 gas occupies 500 mL. This volume is 5/6 of its maximum capacity. The balloon is left in air. It starts rising. The height above which the balloon will burst if temperature of the atmosphere remains constant and the pressure decreases 1 mm for every 100 cm rise of height is:
  • 120 m
  • 136.67 m
  • 126 m
  • 100 m
'a' moles of PCl5, undergoes, the thermal dissociation as: PCl5PCl3+Cl2, the mole fraction of PCl3 at equilibrium is 0.25 and the total pressure is 2.0 atmosphere. The partial pressure of Cl2 at equilibrium is?
  • 2.5
  • 1.0
  • 0.5
  • None
The two bulbs of volume 5 litre and 10 litre containing an ideal gas at 9 atm and 6 atm respectively are connected. What is the final pressure in the two bulbs if the temperature remains constant ? 
  • 15 atm
  • 7 atm
  • 12 atm
  • 21 atm
Assume that you take a flask, evacuate it to remove all the air and find it's mass to be 478.1 g .You then fill the flask with argon to a pressure of 2.15 atm and reweigh it. What would the balance read (in grams) of the flask has a volume of 7.35 L and the temperature is 200C ?
  • 203.6 g
  • 504.3 g
  • 471.1 g
  • None of these
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Practice Class 11 Medical Chemistry Quiz Questions and Answers