The number of molecules present in 1 mL of gas or vapor at STP is:

1. called Loschmidt's number

2. equal to 2.617 x 1019 per mL

3. both (1) and (2)

4. none of the above

Subtopic:  Gas Laws |
 78%
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 Air at sea level is dense. This is a practical application of:

1. Boyle's law                         

2. Charles' law

3. Avogadro's law                   

4. Dalton's law

Subtopic:  Gas Laws |
 52%
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In van der Waals' equation of state of the gas, the constant 'b' is a measure of:

1. Intermolecular collisions per unit volume

2. Intermolecular attraction

3. Volume occupied by molecules

4. Intermolecular repulsions

Subtopic:  van der Waal’s Correction |
 73%
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For 1 mole of gas, the average kinetic energy is given as E. The urms of gas is :

1. [2E/M]1/2

2. [3E/M]1/2

3. [2E/3M]1/2

4. [3E/2M]1/2

Subtopic:  Molecular Velocity |
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600 cc of a gas at a pressure of 750 mm is compressed to 500 cc. Taking the temperature to remain constant, the increase in pressure is:                                         

1. 150 mm                       

2. 250 mm

3. 350 mm                      

4. 450 mm

Subtopic:  Gas Laws |
 74%
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The curve that can not represent Boyle's law is -

1.   

2.  

3.  

4.  

Subtopic:  Gas Laws |
 71%
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The deviation of a gas from ideal behavior is expected to be minimum at -                                    

1. 350 K and 3 atm                   

2. 550 K and 1 atm

3. 250 K and 4 atm                   

4. 450 K and 2 atm

Subtopic:  Gas Laws |
 70%
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An ideal gas expands according to PV=constant. On expansion, the temperature of the gas:

1. Will rise.

2. Will drop.

3. Will remain constant.

4. Cannot be determined because the external pressure is not known.

Subtopic:  Gas Laws |
 69%
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The correct statement for an ideal gas equation is -

1. n is the number of molecules of a gas.

2. V denotes the volume of 1 mole of the gas.

3. n moles of a gas has a volume V.

4. p is the pressure of the gas when only one mole of the gas is present.

Subtopic:  Gas Laws |
 67%
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The gas among the following that can be most steadily liquefied is -

1. NH3                           

2. Cl2

3. SO2                           

4. CO2

Subtopic:  Liquefaction of Gases & Liquid |
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