The vapor of a substance behaves as a gas :

1. Below critical temperature                     

2. Above critical temperature

3. At 100°C                                               

4. At 1000°C

Concept Questions :-

Maxwell distribution curve
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The temperature below which gas should be cooled, before it can be liquified by pressure only is termed as :

1. The dew point                           

2. The freezing point

3. The saturation point                   

4. The critical point

Concept Questions :-

Maxwell distribution curve
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The mean free path of gas molecules depends on (d = molecular diameter)

1. d                                         

2. d2

3. d-2                                   

4. d-1

Concept Questions :-

Mean free path
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For Boyle's law to hold the gas should be :

1. Perfect and of constant mass and temperature

2. Real and of constant mass and temperature

3. Perfect and at a constant temperature but variable mass

4. Real and at a constant temperature but variable mass

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Consider a 1 c.c. sample of air at the absolute temperature T0 at sea level and another 1 c.c. sample of air at a height where the pressure is the one-third atmosphere. The absolute temperature T of the sample at that height is :

1. Equal to T0/3

2. Equal to 3/T0

3. Equal to T0

4. Cannot be determined in terms of T0 from the above data

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To double the volume of a given mass of an ideal gas at 27°C keeping the pressure constant, one must raise the temperature in degree centigrade to

1. 54°                                   

2. 270°

3. 327°                                 

4. 600°

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Which of the following statements about kinetic theory of gases is wrong

1. The molecules of a gas are in continuous random motion

2. The molecules continuously undergo inelastic collisions

3. The molecules do not interact with each other except during collisions

4. The collisions amongst the molecules are of short duration

Concept Questions :-

Kinetic energy of gas
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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

Concept Questions :-

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