- Amal Augustine
- January 28, 2026
Boost Your Score: Henry’s Law Practice Questions for Exams with Expert Tips
Henry’s law is one of the most important laws studied under solutions and gas solubility in chemistry. Aspirants often struggle not because the law is difficult, but because they do not practice enough numerical and assertion-reason questions. This is why henry’s law practice questions for exams play a crucial role in mastering this topic.
Henry’s law states that at constant temperature, the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid. Understanding this concept clearly is the foundation for solving henry’s law practice questions for exams accurately and confidently.
Why Henry’s Law Is Important for Exams
Questions based on Henry’s law frequently appear in competitive exams. These include direct formula-based numericals, conceptual MCQs, graph-based questions, and real-life application problems. Regular exposure to henry’s law practice questions for exams helps aspirants recognize patterns and avoid common mistakes.
In NEET and JEE, Henry’s law is often linked with real-world examples such as carbonated drinks, scuba diving, and oxygen solubility in blood. Practicing henry’s law practice questions for exams improves both speed and conceptual clarity.
Types of Henry’s Law Questions Asked
There are several standard formats in which henry’s law practice questions for exams are framed:
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Numerical problems using the formula
p=kHxp = k_H x
where p is partial pressure, kₕ is Henry’s law constant, and x is mole fraction.
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Conceptual questions asking about the effect of pressure or temperature on solubility.
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Assertion-Reason questions, which test deeper understanding—very common in henry’s law practice questions for exams.
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Application-based questions, such as why soda bottles fizz on opening or why divers suffer from bends.
Practicing all these varieties of henry’s law practice questions for exams ensures full coverage of the syllabus.
Common Mistakes Aspirants Make
Many aspirants memorize the formula without understanding its meaning. As a result, they often confuse mole fraction with molarity or misuse the Henry’s law constant units. Regular solving of henry’s law practice questions for exams helps eliminate these errors.
Another common mistake is ignoring temperature conditions. Since Henry’s law is valid only at constant temperature, ignoring this detail leads to wrong answers in henry’s law practice questions for exams.
How to Prepare Effectively
To master Henry’s law, aspirants should:
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Start with theory and derivation
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Practice easy numericals first
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Gradually move to higher-level henry’s law practice questions for exams
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Analyze solved examples carefully
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Practice previous-year exam questions
Consistent practice of henry’s law practice questions for exams builds confidence and accuracy.
Importance of Real-Life Applications
Questions related to soft drinks, scuba diving, and high-altitude breathing are frequently asked. These application-based henry’s law practice questions for exams test conceptual understanding rather than calculation skills alone.
For example, carbon dioxide remains dissolved in soda under high pressure, but escapes when the bottle is opened—this is a classic scenario discussed in henry’s law practice questions for exams.
30 MCQs on Henry’s Law Practice Questions for Exams:
1. Which of the following aqueous solution will have the boiling point 102.2°C?
(Molal elevation constant for water = 2.2 K kg mol⁻¹)
A. 1 m CH₃COOH
B. 1 m NaCl
C. 1 M NaCl
D. 1 m glucose
Answer: D
2. The depression in freezing point for 0.01 m aqueous solution of Kₓ[Fe(CN)₆] is 0.0744 K. What is the correct molecular formula?
(Kf = 1.86 K kg mol⁻¹)
A. K₃[Fe(CN)₆]
B. K₄[Fe(CN)₆]
C. K[Fe(CN)₆]
D. K₂[Fe(CN)₆]
Answer: A
3. The solution having lowest freezing point is
A. 0.1 M KCl
B. 0.1 M K₂SO₄
C. 0.1 M KNO₃
D. 0.1 M Al₂(SO₄)₃
Answer: D
4. Which observation(s) reflect colligative properties?
(i) 0.5 m NaBr has higher vapour pressure than 0.5 m BaCl₂
(ii) Water freezes at higher temperature than methanol
(iii) 0.1 m NaOH freezes at lower temperature than water
A. (i) and (ii)
B. (ii) and (iii)
C. (i) and (iii)
D. Only (ii)
Answer: C
5. 31 g of ethylene glycol is dissolved in 600 g of water. Find ΔTf
(Kf = 1.86)
A. 0.77 K
B. 1.55 K
C. 4.65 K
D. 3.10 K
Answer: B
6. Which solution shows highest osmotic pressure?
A. 5.0 M urea, i = 1, 67°C
B. 1.5 M A₂B₃, i = 4.1, 27°C
C. 3.0 M AB, i = 1.6, 27°C
D. 2.5 M AB₂, i = 2.5, 57°C
Answer: D
7. To prepare XeF₆, Xe and F₂ are mixed in the ratio
A. 20 : 1
B. 1 : 5
C. 5 : 1
D. 1 : 20
Answer: D
8. If experimental ΔTf = 0.025 K and i = 2, calculated ΔTf is
A. 0.0125 K
B. 0.025 K
C. 0.05 K
D. 0.1 K
Answer: A
9. Cryolite is
A. Na₃AlF₆ – decreases conductivity
B. Na₃AlF₆ – lowers melting point only
C. Na₃AlF₆ – lowers melting point & increases conductivity
D. Used in refining alumina
Answer: C
10. If freezing point decreases to –0.186°C, calculate ΔTb
(Kf = 1.86, Kb = 0.521)
A. 0.521
B. 0.0521
C. 1.86
D. 0.0186
Answer: B
11. Which solution has the highest freezing point?
A. 0.1 M sucrose
B. 0.01 M NaCl
C. 0.01 M Na₂SO₄
D. 0.1 M NaCl
Answer: B
12. Fog is a colloidal solution of
A. Liquid in gas
B. Gas in liquid
C. Solid in liquid
D. Solid in gas
Answer: A
13. The phenomenon described is known as
A. Brownian effect
B. Hardy–Schulze effect
C. Einstein effect
D. Tyndall effect
Answer: D
14. Freezing point of solution formed by dissolving 68.4 g solute in 1 kg water is
(Kf = 1.86)
A. 272.8 K
B. 273.5 K
C. 282.3 K
D. 263.7 K
Answer: A
15. Molar mass of oil of wintergreen is
A. 137 g mol⁻¹
B. 150 g mol⁻¹
C. 560 g mol⁻¹
D. 117 g mol⁻¹
Answer: B
16. Which 0.10 m solution has the lowest freezing point?
A. Al₂(SO₄)₃
B. C₆H₁₂O₆
C. KCl
D. None
Answer: A
17. Order of depression in freezing point decreases as
A. I > II > III
B. III > II > I
C. II > I > III
D. III > I > II
Answer: B
18. Which is a non-colligative property?
A. Elevation in boiling point
B. Osmotic pressure
C. Refractive index
D. Lowering of vapour pressure
Answer: C
19. Weight of glucose added when ΔTf/Kf = 10⁻³ is
A. 18 g
B. 1.8 g
C. 180 g
D. 0.18 g
Answer: D
20. Highest freezing point among equimolal solutions is for
A. C₆H₅NH₃Cl
B. Ca(NO₃)₂
C. La(NO₃)₃
D. C₆H₁₂O₆
Answer: D
21. Depression in freezing point of KCl solution is
A. 3.2°C
B. 1.6°C
C. 0.8°C
D. 5.0°C
Answer: A
22. Atomicity of sulphur in CS₂ is
A. 2
B. 4
C. 6
D. 8
Answer: D
23. Unit of ebullioscopic constant is
A. K (molality)⁻¹
B. mol K⁻¹ kg
C. kg mol⁻¹ K⁻¹
D. kmol kg⁻¹
Answer: A
24. Depression in freezing point is
A. 2xz/y
B. yz/x
C. xz/y
D. yz/2x
Answer: B
25. Mole fraction of benzene in vapour phase is
A. 0.67
B. 0.75
C. 0.5
D. 0.33
Answer: A
26. Different colours of gold sol are due to
A. Valency
B. Concentration
C. Impurities
D. Particle size
Answer: D
27. Correct assertion–reason option is
A. Both correct, R explains A
B. Both correct, R doesn’t explain
C. A true, R false
D. A false, R true
Answer: A
28. Correct increasing order of boiling points is
A. I < III < II < IV
B. IV < III < II < I
C. II < I < III < IV
D. III < I < IV < II
Answer: C
29. Most effective coagulating agent for Fe(OH)₃ sol
A. Mg₃(PO₄)₂
B. BaCl₂
C. NaCl
D. KCN
Answer: A
30. Mass of ethylene glycol needed to prevent freezing at –6°C
A. 804.32 g
B. 204.30 g
C. 400.00 g
D. 304.60 g
Answer: A
Conclusion
Henry’s law is a scoring topic if prepared properly. The key to success lies in repeated and focused practice. By solving a wide variety of henry’s law practice questions for exams, aspirants can strengthen concepts, improve problem-solving speed, and perform confidently in competitive exams. Consistency, clarity, and smart practice of henry’s law practice questions for exams will ensure excellent results.
Amal Augustine is the founder of ExQuizMe, a dynamic learning and quiz platform built to make education engaging, competitive, and fun. A passionate learner and an academic achiever, Amal completed his schooling at Government HSS Manjapra, graduating with 92.5% in Computer Science. He later earned his degree from St. Stephen’s College, University of Delhi, one of India’s most prestigious arts and science institutions.
Currently, Amal is pursuing his Master’s degree at National Sun Yat-sen University, Taiwan, where he continues to deepen his interest in research and technology. Throughout his school and college years, he won 50+ national-level interschool and collegiate quiz competitions, was
Beyond academics, Amal Augustine is an avid reader of science journals, a dedicated research student, and a technology enthusiast who loves programming and exploring the world of Computer Science. Through ExQuizMe, he aims to make learning accessible, enjoyable, and empowering for students across the globe.