The ratio among most probable velocity, mean velocity and root mean square velocity is given by

(a) 1:2:3                           (b) 1: 2:3

(c) 2:3:8π                (d) 2:8π:3

Subtopic:  Molecular Velocity |
 85%
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20 L of SO2 diffuses through a porous partition in 60s. Volume of O2 diffuse under similar condition in 30s will be:-

1. 12.14 L

2. 14.14 L

3. 18.14 L

4. 28.14 L

Subtopic:  Graham's Law |
 73%
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Joule-Thomson coefficient (T/P)H for an ideal gas is:

(a) zero                                  (b) +ve

(c) -ve                                    (d) none of these

Subtopic:  Liquefaction of Gases & Liquid |
 68%
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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 the above

Subtopic:  van der Waal’s Correction |
 74%
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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 |
 91%
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The correct value of the gas constant 'R' is close to 

(a) 0.082 L atm K

(b) 0.082 L atm K-1 mol-1

(c) 0.082 L atm-1 K mol-1

(d) 0.082 L-1 atm-1 K mol

Subtopic:  Ideal Gas Law |
 89%
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The number of molecules present in 1 mL of gas or vapour at STP is:

(1) called Loschmidt's number

(2) equal to 2.617 x 1019 per mL

(3) both (a) and (b)

(4) none of the above

Subtopic:  Gas Laws |
 87%
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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                                           

(a) 150 mm                       (b) 250 mm

(c) 350 mm                       (d) 450 mm

Subtopic:  Gas Laws |
 78%
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An ideal gas expands according to PV=constant. On expansion, the temperature of 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 |
 76%
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The compressibility of a gas is less than unity at STP. Therefore:

(1) Vm > 22.4 litre                           

(2) Vm < 22.4 litre

(3) Vm = 22.4 litre                           

(4) Vm = 44.8 litre

Subtopic:  Compressibility Factor |
 74%
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