The mean free path (λ) of a gas sample is given by:

1. λ=2πσ2N                               

2. λ=1/2πσ2N

3. λ=2πμσ2N                               

4. none of these

Subtopic:  Kinetic Theory of Gas |
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Which is lighter than dry air?

1. Moist air                             

2. SO2

3. Cl2                                      

4. O2

Subtopic:  Introduction to States of Matter |
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The ratio a/b (the terms used in van der Waals' equation) has the unit:

1. atm lire mol-1                           

2.  atm dm3 mol-1

3. dyne cm mol-1                           

4. all of these

Subtopic:  Vanderwaal Correction |
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In the vander Waals' equation, the constant 'a' and 'b' with temperature shows which trend:

1. both remains same

2. 'a' remains same, 'b' varies

3. 'a' varies, 'b' remains same

4. both varies

Subtopic:  Vanderwaal Correction |
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At relatively high pressure, van der Waals' equation reduces to:

1. PV = RT

2. PV = RT + a/v

3. PV = RT + Pb

4. PV = RT - a/V2

Subtopic:  Vanderwaal Correction |
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When is the deviation more in the behaviour of a gas from the ideal gas equation pV=nRT?     

1. AT high temperature and low pressure

2. At low temperature and high pressure

3. At high temperature and high pressure

4. At low temperature and low pressure

Subtopic:  Kinetic Theory of Gas |
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Joule-Thomson coefficient (T/P)H for an ideal gas is:

1. zero                                 

2. +ve

3. -ve                                   

4. none of these

Subtopic:  Liquefaction of Gases |
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All the three states H2O, i.e., the triple point for H2O the equilibrium,

                       Ice WaterVapour exist at:

1. 3.85 mm and 0.0981 °C

2. 4.58 mm and 0.0098 °C

3. 760 mm and 0°C

4. none of the above

Subtopic:  Liquefaction of Gases |
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The unit of van der Waals' constant 'a' is:

1. atm litre2 mol-2                       

2. dyne cm4 mol-2

3. newton m4 mol-2                     

4. all of these           

Subtopic:  Vanderwaal Correction |
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The unit of van der Waals' constant 'b' is :

1. cm3 mol-1

2. litre mol-1

3. m3 mol-1

4. all of these 

Subtopic:  Vanderwaal Correction |
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