At which one of the following temperature pressure conditions, the deviation of a gas from ideal behaviour is expected to be minimum?                                     

(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 |
 76%
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Select the correct statement. In the gas equation PV = nRT                 

(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 the gas have a volume V

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

Subtopic:  Gas Laws |
 75%
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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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