For real gases van der Waals equation is written as

(P+an2V2) (V-nb) = nRT

where 'a' and 'b' are van der Waals constants.


Two sets of gases are:
(I) O2, CO2 , H2 and He        (II)CH4, O2  and H2 
The gases given in set-I are in increasing order of 'b' and gases given in set-II are in decreasing order of 'a'. Select the correct order from the following:

1. ( I)O2<He<H2<CO2(II) H2>O2>CH4

2. ( I)H2<He<O2<CO2(II) CH4>O2>H2

3. ( I)H2<O2<He<CO2(II) O2>CH4>H2

4. ( I)He<H2<CO2<  O2(II) CH4>H2>O2

Subtopic:  van der Waal’s Correction |
 68%
From NCERT
AIPMT - 2012
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The pressure exerted by 6.0 g of methane gas in a 0.03 m3 vessel at 129 ºC is:
(Atomic masses : C = 12.01, H = 1.01 and R = 8.314 JK–1mol–1)

1. 13409 Pa

2. 41648 Pa

3. 31684 Pa

4. 215216 Pa

Subtopic:  Ideal Gas Law |
 77%
From NCERT
AIPMT - 2010
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A bubble of air is underwater at a temperature15°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?

1. Volume will become greater by a factor of 2.5
2. Volume will become greater by a factor of 1.6
3. Volume will become greater by a factor of 1.1
4. Volume will become smaller by a factor of 0.70

Subtopic:  Gas Laws |
 64%
From NCERT
AIPMT - 2011
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A certain gas takes three times as long to effuse out as helium. Its molecular mass will be:

1.  36 u
2.  64 u
3.  9 u
4.  27 u

Subtopic:  Graham's Law |
 72%
AIPMT - 2012
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What is the density of N2 gas at 227 °C and 5.00 atm pressure?

(R = 0.082 L Atm K–1 mol–1)
1. 1.40 g/L
2. 2.81 g/L
3. 3.41 g/L
4. 0.29 g/L
Subtopic:  Gas Laws |
 80%
From NCERT
NEET - 2013
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If a gas expands at a constant temperature, it indicates that:

1. Kinetic energy of the molecules decreases

2. The pressure of the gas increases

3. The kinetic energy of the molecules remains the same

4. The number of molecules of gas increases

Subtopic:  Kinetic Theory of Gas |
 66%
From NCERT
AIPMT - 2008
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The energy absorbed by each molecule (A2) of a substance is 4.4 x 10-19 J and bond energy per molecule is 4.0 x 10-19 J. The kinetic energy of the molecule per atom will be:

1. 2.0×10-20 J

2. 2.2×10-19 J

3. 2.0×10-19 J

4. 4.0×10-20 J

Subtopic:  Kinetic Theory of Gas |
AIPMT - 2009
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By what factor does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled?

1.  2.8
2.  4.0
3.  1.4
4.  2.0

Subtopic:  Molecular Velocity |
 73%
AIPMT - 2011
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Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 second respectively. The molecular mass of A is 49 u. Molecular mass of B will be:

1.  12.25 U

2.  6.50 U

3.  25.00 U

4.  50.00 U

Subtopic:  Graham's Law |
 81%
AIPMT - 2011
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A gaseous mixture was prepared by taking equal moles of CO and N2. If the total pressure of the mixture was found to be 1 atmosphere, then the partial pressure of the nitrogen (N2) in the mixture is:

1.  0.8 atm
2.  0.9 atm
3.  1 atm
4.  0.5 atm

Subtopic:  Dalton's Law |
 83%
From NCERT
AIPMT - 2011
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