Under which of the following conditions is the law PV = RT obeyed most closely by a real gas

1. High pressure and high temperature

2. Low pressure and low temperature

3. Low pressure and high temperature

4. High pressure and low temperature

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The gas equation PVT= constant is true for a constant mass of an ideal gas undergoing

1. Isothermal change                           

2. Adiabatic change

3. Isobaric change                               

4. Any type of change

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That gas cannot be liquified :

1. Which obeys Vander Waal's equation

2. Which obeys gas equation at every temperature and pressure

3. The molecules of which are having potential energy

4. Which is a inert gas

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At STP the mass of one litre of air is 1.293 gm. The value of the specific gas constant will be :

1. 0.29 J/K-gm                       

2. 4.2 J/K-gm

3. 8.3 J/K-gm                         

3. 16.5 J/K-gm

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Specific heat
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The pressure P, volume V and temperature T of gas in the jar A and the other gas in the jar B at pressure 2P, volume V/4 and temperature 2T, then the ratio of the number of molecules in the jar A and B will be :

1.  1 : 1                             

2.  1 : 2

3.  2 : 1                             

4.  4 : 1

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A balloon contains 500 m3 of helium at 27°C and 1 atmosphere pressure. The volume of the helium at – 3°C temperature and 0.5 atmosphere pressure will be :

1.  500 m3                                 

2.  700 m3

3.  900 m3                                 

4. 1000 m3

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A vessel contains 1 mole of O2 gas (molar mass 32) at a temperature T. The pressure of the gas is P. An identical vessel containing one mole of He gas (molar mass 4) at temperature 2T has a pressure of

1. P/8                                   

2. P

3. 2P                                   

4. 8P

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A given mass of a gas is allowed to expand freely until its volume becomes double. If Cb and Ca are the velocities of sound in this gas before and after expansion respectively, then Ca is equal to :

1. 2Cb                                 

2. 2Cb

3. Cb                                   

4. 12Cb

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One litre of Helium gas at a pressure 76 cm of Hg and temperature 27° is heated till its pressure and volume are doubled. The final temperature attained by the gas is :

1.  927°C                                 

2.  900°C

3.  627°C                                 

4.  327°C

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The molecular weight of a gas is 44. The volume occupied by 2.2 g of this gas at 0°C and 2 atm. Pressure will be

1.  0.56 litre                           

2.  1.2 litres

3.  2.4 litres                           

4.  5.6 litres

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