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WorksheetsReal gases
Total questions: 22
Worksheet time: 15mins
If Z is the compressibility factor, van der Waals’ equation at low pressure can be written as :
Z=1-Pb/RT
Z=1+Pb/RT
Z = 1+RT/Pb
Z = 1-a/VmRT
Which intermolecular force is most responsible in allowing xenon gas to liquefy?
Instantaneous dipole induced dipole
Ion dipole
Ionic
Dipole-dipole
The temperature at which oxygen molecules have the same root mean square
speed as helium atoms have at 300 K is :
(Atomic masses : He = 4 u, O = 16 u)
1200 K
600 K
300 K
2400 K
The compressibility factor for a real gas at high pressure is :
1-Pb/RT
1+ RT/Pb
1
1+Pb/RT
The relationship among most probable velocity, average velocity and root mean
Square velocity is respectively :
√2 : √(8/π) : √3
√2 :√3 : √(8/π )
√3 : √(8/π) : √2
√(8/π) : √3 : √2
Value of gas constant R is
0.082 L atm
0.987 cal mol-1 K-1
8.3 J mol-1 K-1
83 erg mol-1K-1
By how many folds the temperature of a gas would increase when the root mean
Square velocity of the gas molecules in a container of fixed volume is increased from 5×104 cm/s to 10×104 cm/s?
four
three
two
six
Kinetic theory of gases proves
Only boyle’s law
Only Charle’s law
Only Avogadro’s law
all of these
Which one of the following is the wrong assumption of kinetic theory of gases?
All the molecules move in a straight line between collision and with the same velocity.
Molecules are separated by great distances compared to their sizes.
Pressure is the result of elastic collision of molecules with the container’s wall.
Momentum and energy always remain conserved.
‘a’ and ‘b’ are Vander Waal’s constants for gases. Chlorine is more easily liquified than ethane because:
a for Cl2 < a for C2H6 but b for Cl2 > b for C2H6
a for Cl2 > a for C2H6 but b for Cl2 < b for C2H6
a and b for Cl2 > a and b for C2H6
a and b for Cl2 < a and b for C2H6
A gaseous compound of nitrogen and hydrogen contains 12.5% (by mass) of
Hydrogen. The density of the compound relative to hydrogen is 16. The molecular formula of the compound is :
NH2
NH3
N3H
N2H4
The one that is extensively used as a piezo electric material is
quartz
amorphous silica
trydymite
mica
Which primitive unit cell has unequal edge lengths and all axial lengths different from 900.
Monoclinic
Triclinic
Tetragonal
Hexagonal
In Van der waals equation of state of the gas law, the constant b is a measure of
Intermolecular repulsions
Intermolecular attraction
Volume occupied by molecules
Intermolecular collisions per unit volume.
A pressure cooker reduces cooking time for food because
Heat is more evenly distributed in the cooking space.
B.P of water involved in cooking is increased
The higher pressure inside the cooker crushes the food.
Cooking involves chemical changes helped by a rise in temperature.
According to kinetic theory of gases, in an ideal gas, between two successive collisions a gas molecule travels
In a circular path
In wavy path
In a straight line path
with an accelerated velocity
Which of the following is the correct correction for intermolecular forces in Van der Waals equation?
(V-nb)
(P + n2a / V2)
RT
(RT)-1
The van der Waals equation is a modification of ideal gas equation. Which of the following factor is not accounted for the modification?
Volume of gas particles.
Attractive forces between particles.
Position of the particles.
In van der Waals equation, pressure correction is due to force of attraction between molecules.
True
False
The value of constant 'a' in van der Waals equation for various gases are given below:
Nitrogen gas, N2= 1.390 L2 atm mol-2
Oxygen gas, O2 = 1.360 L2 atm mol-2
Ammonia gas, NH3 = 4.170 L2 atm mol-2
Methane gas, CH4 = 2.253 L2 atm mol-2
Arrange these gases in the order of decreasing strength of intermolecular forces.
NH3 < CH4 < N2 < O2
NH3 > CH4 > N2 > O2
O2 < N2 < CH4 < NH3
O2 > N2 > CH4 > NH3
The value of constant 'a' in van der Waals equation for various gases are given below:
Nitrogen gas, N2= 1.390 L2 atm mol-2
Oxygen gas, O2 = 1.360 L2 atm mol-2
Ammonia gas, NH3 = 4.170 L2 atm mol-2
Methane gas, CH4 = 2.253 L2 atm mol-2
Arrange these gases in the order of most ideal to least ideal gas.
NH3 < CH4 < N2 < O2
NH3 > CH4 > N2 > O2
O2 < N2 < CH4 < NH3
O2 > N2 > CH4 > NH3
From the van der Waals constant 'b' for H2, CO2 and N2 gas, which of the gas have the largest volume?
Hydrogen gas, H2 = 0.02661 L mol-1
Carbon dioxide, CO2 = 0.04267 L mol-1
Nitrogen gas, N2 = 0.03913 L mol-1
Hydrogen gas. H2
Carbon dioxide, CO2
Nitrogen gas, N2
