chemistry : class11 Boiling point : Properties of hydrogen : Hydrogen MCQ Questions and Answers
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Boiling point
MCQ questions and answers.
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MCQ Questions
1. What is the normal boiling point of hydrogen gas (H₂) at atmospheric pressure?
A.
20.27 K
B.
77 K
C.
273 K
D.
373 K
Correct Answer:
20.27 K
Explanation:
Hydrogen has a very low normal boiling point of about 20.27 K, or −252.87°C, at atmospheric pressure.
2. The boiling point of hydrogen in degrees Celsius is approximately:
A.
−252.87°C
B.
−196°C
C.
−78°C
D.
0°C
Correct Answer:
−252.87°C
Explanation:
Hydrogen boils at about 20.27 K, which corresponds to approximately −252.87°C.
3. Hydrogen has a very low boiling point mainly because its molecules have:
A.
Weak intermolecular attractions
B.
Strong ionic attractions
C.
Strong hydrogen bonding
D.
Metallic bonding
Correct Answer:
Weak intermolecular attractions
Explanation:
H₂ molecules are nonpolar and experience only weak intermolecular attractions, giving hydrogen a very low boiling point.
4. Which of the following substances has a boiling point closest to that of hydrogen?
A.
Helium
B.
Water
C.
Nitrogen
D.
Oxygen
Correct Answer:
Helium
Explanation:
Helium also has an extremely low boiling point, close to that of hydrogen, whereas nitrogen, oxygen, and water boil at much higher temperatures.
5. At its normal boiling point, hydrogen changes from:
A.
Liquid to gas
B.
Gas to liquid
C.
Solid to liquid
D.
Solid to gas
Correct Answer:
Liquid to gas
Explanation:
The boiling point is the temperature at which a liquid changes into a gas at a given pressure.
6. Compared with nitrogen, the boiling point of hydrogen is:
A.
Much lower
B.
Much higher
C.
Exactly the same
D.
Slightly higher
Correct Answer:
Much lower
Explanation:
Hydrogen boils at about 20.27 K, while nitrogen boils at about 77 K, so hydrogen has a much lower boiling point.
7. Which temperature is closest to the normal boiling point of hydrogen on the Kelvin scale?
A.
20 K
B.
50 K
C.
100 K
D.
300 K
Correct Answer:
20 K
Explanation:
The normal boiling point of hydrogen is approximately 20.27 K, so 20 K is the closest value.
8. The exceptionally low boiling point of hydrogen indicates that hydrogen molecules are:
A.
Held together by weak forces
B.
Held together by strong ionic forces
C.
Joined by metallic bonds
D.
Strongly associated by hydrogen bonds
Correct Answer:
Held together by weak forces
Explanation:
A very low boiling point indicates that little energy is required to separate the molecules because their intermolecular forces are weak.
9. Which statement about the boiling point of hydrogen is correct?
A.
Hydrogen boils at a temperature far below room temperature.
B.
Hydrogen boils at room temperature.
C.
Hydrogen boils above the boiling point of water.
D.
Hydrogen has the same boiling point as oxygen.
Correct Answer:
Hydrogen boils at a temperature far below room temperature.
Explanation:
Hydrogen boils at about −252.87°C, which is far below room temperature.
10. At normal atmospheric pressure, hydrogen can exist as a liquid only when its temperature is:
A.
Below about 20.27 K
B.
Above about 373 K
C.
Above about 273 K
D.
Exactly 100 K
Correct Answer:
Below about 20.27 K
Explanation:
Hydrogen boils at about 20.27 K at normal atmospheric pressure, so it remains liquid only below this temperature, provided it is above its melting point.
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