If a Vander-Waal's gas expands freely, then final temperature is

1. Less than the initial temperature

2. Equal to the initial temperature

3. More than the initial temperature

4. Less or more than the initial temperature depending on the nature of the gas

Concept Questions :-

Maxwell distribution curve
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In Vander Waal's equation P+aV2V-b=RT, the dimensions of a are

1. M1L5T-2                    

2. M0L2T-3 

3. M1L3T-2                    

4. M1L1T-2

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Which law states that effect of pressure is same for all portion

1. Pascal’s law                               

2. Gay-lussac’s law

3. Dalton’s law                             

4. None of these

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The equation for an ideal gas is PV = RT, where V represents the volume of

1. 1 gm gas                         

2. Any mass of the gas

3. One gm mol gas               

4. One litre gas

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Under which of the following conditions is the law PV = RT obeyed most closely by a real gas

1. High pressure and high temperature

2. Low pressure and low temperature

3. Low pressure and high temperature

4. High pressure and low temperature

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The gas equation PVT= constant is true for a constant mass of an ideal gas undergoing

1. Isothermal change                           

2. Adiabatic change

3. Isobaric change                               

4. Any type of change

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That gas cannot be liquified :

1. Which obeys Vander Waal's equation

2. Which obeys gas equation at every temperature and pressure

3. The molecules of which are having potential energy

4. Which is a inert gas

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At STP the mass of one litre of air is 1.293 gm. The value of the specific gas constant will be :

1. 0.29 J/K-gm                       

2. 4.2 J/K-gm

3. 8.3 J/K-gm                         

3. 16.5 J/K-gm

Concept Questions :-

Specific heat
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The pressure P, volume V and temperature T of gas in the jar A and the other gas in the jar B at pressure 2P, volume V/4 and temperature 2T, then the ratio of the number of molecules in the jar A and B will be :

1.  1 : 1                             

2.  1 : 2

3.  2 : 1                             

4.  4 : 1

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A balloon contains 500 m3 of helium at 27°C and 1 atmosphere pressure. The volume of the helium at – 3°C temperature and 0.5 atmosphere pressure will be :

1.  500 m3                                 

2.  700 m3

3.  900 m3                                 

4. 1000 m3

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