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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:
- 0.0821
- 1.0821
- 82.21
- 82.1
2. Calorie is diffuse to:
- 0.4184 )
- 41.84 )
- 4.184 )
- 10.418)
3. Which gas diffuses most rapidly?
- HCI
- NH3
- SO2
- CL
4. Which gas has highest diffusion rate?
- SO2
- Cl2
- NH3
- CO2
5. Mathematically Boyle’s law is shown as:
- PT = K
- VT = K
- P/T= K
- PV = K
6. Absolute zero is equal to:
- 273°C
- -273°C
- 0°C
- 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:
- Ideal
- Non-ideal
- highly polar
- Liquefied easily
8. The constant factor in Charles’s law is:
- Volume
- temperature
- Pressure
- all of these
9. Which gas will diffuse more rapidly:
- CO2
- NH3
- HCI
- SO2
10. Normal human body temperature is:
- 37°C
- 98.6°C
- 37°F
- 273 K
11. Partial pressure of oxygen in human lungs in torr is:
- 161
- 116
- 159
- 760
12. The molar volume of CO2 is maximum at which among the following:
- S.T.P
- 127°C and 1 atm
- 0°C and 2 atm
- 273K
13. The order of rate of diffusion of gases NH3, SO2, Cl2 and CO2 is one among the following:
- NH3 > SO2 > Cl2 > CO2
- NH3 > CO2 > SÖ2 > Cl2
- Cl2 > SO2 > CO2 > NH3
- NH3 > CO2 > Cl2 > SO2
14. Plasma is conductor of electricity:
- Bad
- Poor
- Good
- 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:
- General gas equation
- Arrhenius equation
- Clausius Clapeyron equation
- 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:
- Remain unchanged
- Increase four times
- Reduce to V4
- Be doubled
17. Pressure remaining constant, at which temperature the volume of a gas will become twice of what it is at 0°C.
- 546°C
- 200°C
- 546K
- 273 K
18. One torr is equal to:
- One atmosphere
- One Pascal
- One mm of Hg
- 76 cm of Hg
19. S.I unit of pressure is:
- Torr
- mm Hg
- Nm-2
- Pound inch-2
20. The spreading of fragrance of scent in air is due to:
- Effusion
- Diffusion
- Osmosis
- Density.
21. The value of R (in Nm K moll) is:
- 8.214 .
- 8.314
- 0.0321
- 62.4
22. Which of the following will have the same number of moles at S.T.P?
- 280 cm of CO2 and 280 cm of N2O
- 11.2 dm of O2 and 32 g of O2
- 44 g CO2 and 11.2 dm3 of CO
- 28.0g N2 and 5.6 g O2 of oxygen
23. The absolute zero is:
- Attainable
- May be attainable
- Un attainable in gaseous state
- My not be attainable
24. Standard temperature:
- 0°C
- 75°C
- 273°C
- 100°C
25. The colour of NO2 gas is:
- Yellow
- Green
- Brown
- Blue
26. Pilots feel uncomfortable breathing in unpressurized cabins:
- Due to high pressure of CO2
- Due to low pressure of O2
- Due to fatigue
- Due to low pressure of CO2
27. Plasmas are found in everything from sun to:
- Atoms
- Molecules
- Electrons
- Quarks
28. Which gas will diffuse more rapidly among the following?
- N2
- H2
- CO
- None