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Chapter No 3

Gases

1. The ideal gas constant R, when expressed in dm atm. mol-1.K-1 units have a value of:

  1. 0.0821
  2. 1.0821 
  3. 82.21
  4. 82.1

2. Calorie is diffuse to:

  1. 0.4184 )
  2. 41.84 )
  3. 4.184 )
  4. 10.418)

3. Which gas diffuses most rapidly?

  1. HCI
  2. NH3
  3. SO2
  4. CL

4. Which gas has highest diffusion rate?

  1. SO2
  2. Cl2
  3. NH3
  4. CO2

5. Mathematically Boyle’s law is shown as:

  1. PT = K
  2. VT = K
  3. P/T= K
  4. PV = K

6. Absolute zero is equal to:

  1. 273°C
  2. -273°C
  3. 0°C
  4. 273 K

7. If the values of ‘a’ and ‘b’ in Van der Waal’s equation are close to zero for a gas, then the gas is:

  1. Ideal
  2. Non-ideal
  3. highly polar
  4. Liquefied easily

8. The constant factor in Charles’s law is:

  1. Volume
  2. temperature
  3. Pressure
  4. all of these

9. Which gas will diffuse more rapidly:

  1. CO2
  2. NH3
  3. HCI 
  4. SO2

10. Normal human body temperature is:

  1. 37°C
  2. 98.6°C
  3. 37°F
  4. 273 K

11. Partial pressure of oxygen in human lungs in torr is:

  1. 161
  2. 116
  3. 159
  4. 760

12. The molar volume of CO2 is maximum at which among the following:

  1. S.T.P
  2. 127°C and 1 atm
  3. 0°C and 2 atm
  4. 273K

13. The order of rate of diffusion of gases NH3, SO2, Cl2 and CO2 is one among the following:

  1. NH3 > SO2 > Cl2 > CO2
  2. NH3 > CO2 > SÖ2 > Cl2
  3. Cl2 > SO2 > CO2 > NH3
  4. NH3 > CO2 > Cl2 > SO2

14. Plasma is conductor of electricity:

  1. Bad
  2. Poor
  3. Good
  4. None

15. To calculate the pressure and volume of a real gas under the non-ideal conditions, alternate kinetic equation has been developed. This is known as:

  1. General gas equation
  2. Arrhenius equation
  3. Clausius Clapeyron equation
  4. van der Waal’s equation

16. If absolute temperature of a gas is doubled and pressure is reduced to one half, the volume of the gas will:

  1. Remain unchanged
  2. Increase four times
  3. Reduce to V4
  4. Be doubled

17. Pressure remaining constant, at which temperature the volume of a gas will become twice of what it is at 0°C.

  1. 546°C
  2. 200°C
  3. 546K
  4. 273 K

18. One torr is equal to:

  1. One atmosphere
  2. One Pascal
  3. One mm of Hg
  4. 76 cm of Hg

19. S.I unit of pressure is:

  1. Torr
  2. mm Hg
  3. Nm-2
  4. Pound inch-2

20. The spreading of fragrance of scent in air is due to:

  1. Effusion
  2. Diffusion
  3. Osmosis
  4. Density.

21. The value of R (in Nm K moll) is:

  1. 8.214 .
  2. 8.314
  3. 0.0321
  4. 62.4

22. Which of the following will have the same number of moles at S.T.P?

  1. 280 cm of CO2 and 280 cm of N2O
  2. 11.2 dm of O2 and 32 g of O2
  3. 44 g CO2 and 11.2 dm3 of CO
  4. 28.0g N2 and 5.6 g O2 of oxygen

23. The absolute zero is:

  1. Attainable
  2. May be attainable
  3. Un attainable in gaseous state
  4. My not be attainable

24. Standard temperature:

  1. 0°C
  2. 75°C
  3. 273°C
  4. 100°C

25. The colour of NO2 gas is:

  1. Yellow
  2. Green
  3. Brown
  4. Blue

26. Pilots feel uncomfortable breathing in unpressurized cabins:

  1. Due to high pressure of CO2
  2. Due to low pressure of O2
  3. Due to fatigue
  4. Due to low pressure of CO2

27. Plasmas are found in everything from sun to:

  1. Atoms
  2. Molecules
  3. Electrons
  4. Quarks

28. Which gas will diffuse more rapidly among the following?

  1. N2
  2. H2
  3. CO
  4. None