| 1. | Which is the correct relation between the diffusion rates of gases and their densities? |
A. r₁/r₂ = √d₁/d₂ | |
B. r₁/r₂ – √d₂/d₁ | |
C. r₁/r₂ – √d₁/d₂ | |
D. r₁/r₂ – d₂/d₁ |
| 2. | which gas is lighter than air |
A. oxygen | |
B. ammonia | |
C. chlorine | |
D. propane |
| 3. | Under what conditions does a real gas behave like an ideal gas? |
A. high pressure low temperature | |
B. low pressure high temperature | |
C. high temperature high pressure | |
D. low pressure low temperature |
| 4. | If an open bottle of perfume is kept in a corner of a room, its fragrance spreads to all the parts of the room, this is because |
A. evaporation | |
B. evaporation | |
C. diffusion | |
D. sublimation |
| 5. | Despite the difference in density, the process of mixing of gases against the force of gravity of the earth is called natural process. |
A. evaporation of gases | |
B. liquefaction of gases | |
C. diffusion of gases | |
D. evaporation of gases |
| 6. | Evaporation density of a gas is 14, what will be its molecular weight? |
A. 14 | |
B. 21 | |
C. 28 | |
D. 42 |
| 7. | The molecular mass of a gas is proportional to its vapor density |
A. double | |
B. treble | |
C. four times | |
D. half |
| 8. | The law of diffusion of gases is used |
A. to separate isotopes | |
B. To determine the vapor density of gases | |
C. to separate a mixture of gases | |
D. all of these |
| 9. | The rate of diffusion of carbon carbon dioxide is less than that of air, because it |
A. gets lighter | |
B. gets heavy | |
C. is very light | |
D. quite heavy |
| 10. | The essential condition for the diffusion of gases is that the chemical percentage between them |
A. be possible | |
B. not be possible | |
C. be slow | |
D. be fast |