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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A gas at 27°C temperature and 30 atmospheric pressure is allowed to expand to the atmospheric pressure. If the volume becomes 10 times its initial volume, then the final temperature becomes

1.  100°C                             

2.  173°C

3.  273°C                             

4.  – 173°C

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In the relation n=PVRT, n=

1.  Number of molecules                             

2.  Atomic number

3.  Mass number                                         

4.  Number of moles

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The equation of state corresponding to 8 g of O2 is :

1.  PV = 8RT                           

2.  PV = RT/4

3.  PV = RT                             

4.  PV = RT/2

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