1. What is the color of pure hydrogen gas at room temperature?
A.
Blue
B.
Colorless
C.
Yellow
D.
Green
Correct Answer:
Colorless
Explanation:
Pure hydrogen gas is colorless, meaning it does not have a visible color.
2. What is the odor of pure hydrogen gas?
A.
Pungent
B.
Sweet
C.
Odorless
D.
Sulfur-like
Correct Answer:
Odorless
Explanation:
Pure hydrogen gas is odorless because it has no smell.
3. Which statement correctly describes the appearance of hydrogen gas?
A.
It is a colored gas.
B.
It is a colorless gas.
C.
It is a black gas.
D.
It is a reddish gas.
Correct Answer:
It is a colorless gas.
Explanation:
Hydrogen gas cannot be seen because it is colorless.
4. Which statement correctly describes the smell of hydrogen gas?
A.
It has a strong smell.
B.
It has a sweet smell.
C.
It has no smell.
D.
It has a rotten-egg smell.
Correct Answer:
It has no smell.
Explanation:
Pure hydrogen is odorless and therefore has no detectable smell.
5. A sample of pure hydrogen gas is observed. Which pair of properties will it show?
A.
Colored and odorous
B.
Colorless and odorless
C.
Colored and odorless
D.
Colorless and strongly odorous
Correct Answer:
Colorless and odorless
Explanation:
Pure hydrogen has neither visible color nor detectable odor.
6. Why is pure hydrogen gas not visible to the eyes?
A.
Because it is colorless
B.
Because it is strongly colored
C.
Because it has a strong odor
D.
Because it is black
Correct Answer:
Because it is colorless
Explanation:
Hydrogen cannot be seen because it does not possess a visible color.
7. Which of the following is a physical property of hydrogen related to odor?
A.
It is odorless.
B.
It smells like chlorine.
C.
It smells like ammonia.
D.
It has a pungent odor.
Correct Answer:
It is odorless.
Explanation:
The absence of smell is the characteristic odor property of pure hydrogen.
8. How would pure hydrogen gas appear in a transparent container?
A.
It would appear blue.
B.
It would appear yellow.
C.
It would appear colorless.
D.
It would appear brown.
Correct Answer:
It would appear colorless.
Explanation:
Hydrogen gas is colorless, so it would not give the container a visible color.
9. Which combination correctly gives the color and odor of hydrogen gas?
A.
Blue and pungent
B.
Colorless and odorless
C.
Green and sweet-smelling
D.
Yellow and sulfur-smelling
Correct Answer:
Colorless and odorless
Explanation:
Hydrogen is characterized by having no color and no odor in its pure form.
10. If a gas has no color and no smell, which description matches pure hydrogen?
A.
Colorless and odorless
B.
Colored and odorless
C.
Colorless and strongly smelling
D.
Colored and strongly smelling
Correct Answer:
Colorless and odorless
Explanation:
Pure hydrogen is both colorless and odorless.
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