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 |
 69%
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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 & Liquid |
 63%
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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:  van der Waal’s Correction |
 80%
From NCERT
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At STP, 0.50-mole H2 gas and 1.0 mole He gas                                  

1. have equal average kinetic energies

2. have equal molecular speeds

3. occupy equal volumes

4. have equal effusion rates

Subtopic:  Kinetic Theory of Gas |
 56%
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 The compressibility factor for H2 and He is usually:

1. >1                                     

2. =1

3. <1                                     

4. either of these

Subtopic:  Compressibility Factor |
 67%
From NCERT
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Boyle's law is applicable in :

1. Isobaric process

2. Isochoric process

3. Isothermal process

4. Adiabatic process

Subtopic:  Gas Laws |
 85%
From NCERT
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The correct value of the gas constant 'R' is close to 

1. 0.082 L atm K

2. 0.082 L atm K-1 mol-1

3. 0.082 L atm-1 K mol-1

4. 0.082 L-1 atm-1 K mol

Subtopic:  Ideal Gas Law |
 84%
From NCERT
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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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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%
From NCERT
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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%
From NCERT
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