A gas such as carbon monoxide would be most likely to obey the ideal gas law at
1. High temperature and low pressure
2. Low temperature and high pressure
3. High temperature and high pressure
4. Low temperature and low pressure

Subtopic:  Kinetic Theory of Gas |
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Equal masses of H2, O2 and methane have been taken in a container of volume V at temperature 27 ºC in identical conditions. The ratio of the volumes of gases H2:O2 : methane would be -
1. 8:16:1
2. 16:8:1
3. 16:1:2
4. 8:1:2

Subtopic:  Gas Laws |
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Maximum deviation from ideal gas is expected from :
1. N2 (g)
2. CH4 (g)
3. NH3 (g)
4. H2 (g)
Subtopic:  Compressibility Factor |
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50 mL of each gas A and of gas B takes 200 and 150 s respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas B is 36, the molecular mass of gas A will be

1. 96

2. 128

3. 32

4. 64

Subtopic:  Graham's Law |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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