1. Which gas diffuses fastest under the same conditions?
A.
Hydrogen
B.
Oxygen
C.
Nitrogen
D.
Carbon dioxide
Correct Answer:
Hydrogen
Explanation:
Hydrogen has the lowest molar mass among these gases, so it diffuses fastest according to Graham's law.
2. According to Graham's law, the rate of diffusion of a gas is inversely proportional to its:
A.
Temperature
B.
Molar mass square root
C.
Pressure only
D.
Volume only
Correct Answer:
Molar mass square root
Explanation:
Graham's law states that diffusion rate is inversely proportional to the square root of the molar mass of the gas.
3. Why does hydrogen diffuse faster than oxygen?
A.
Hydrogen has a lower molar mass
B.
Hydrogen has a higher molar mass
C.
Hydrogen has a darker color
D.
Hydrogen has a higher boiling point
Correct Answer:
Hydrogen has a lower molar mass
Explanation:
A gas with lower molar mass moves and diffuses faster under identical conditions.
4. If hydrogen and oxygen are kept under identical conditions, which gas will take less time to diffuse through a small opening?
A.
Hydrogen
B.
Oxygen
C.
Both take equal time
D.
Neither gas diffuses
Correct Answer:
Hydrogen
Explanation:
Hydrogen diffuses more rapidly because its molar mass is much lower than that of oxygen.
5. The rate of diffusion of hydrogen is greater than that of chlorine because hydrogen has:
A.
A lower molecular mass
B.
A higher molecular mass
C.
A higher density
D.
A lower temperature
Correct Answer:
A lower molecular mass
Explanation:
According to Graham's law, gases with lower molecular mass diffuse faster; hydrogen is much lighter than chlorine.
6. A gas with a smaller molar mass generally has a:
A.
Higher diffusion rate
B.
Lower diffusion rate
C.
Zero diffusion rate
D.
Constant diffusion rate for all gases
Correct Answer:
Higher diffusion rate
Explanation:
Diffusion rate increases as molar mass decreases, as expressed by Graham's law.
7. Compared with hydrogen, helium diffuses at a rate that is:
A.
Slightly lower
B.
Much higher
C.
Exactly zero
D.
Unrelated to molar mass
Correct Answer:
Slightly lower
Explanation:
Helium has a slightly greater molar mass than hydrogen, so it diffuses slightly more slowly.
8. If the molar mass of a gas increases, its diffusion rate generally:
A.
Decreases
B.
Increases
C.
Becomes infinite
D.
Remains unrelated to molar mass
Correct Answer:
Decreases
Explanation:
Graham's law shows that diffusion rate is inversely related to the square root of molar mass.
9. Which pair of gases is suitable for comparing diffusion rates using Graham's law?
A.
Hydrogen and oxygen
B.
Water and ice
C.
Salt and sugar
D.
Copper and iron
Correct Answer:
Hydrogen and oxygen
Explanation:
Graham's law compares the diffusion rates of gases, such as hydrogen and oxygen, using their molar masses.
10. Hydrogen passes through a porous partition faster than a heavier gas mainly because hydrogen molecules have:
A.
Lower mass
B.
Higher mass
C.
No motion
D.
No kinetic energy
Correct Answer:
Lower mass
Explanation:
At the same temperature, the lower mass of hydrogen results in a higher diffusion rate through a porous partition.
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