Hydrogen Quiz - ICSE Class 9 Chemistry

Free practice quiz: Hydrogen (ICSE Class 9 Chemistry). 49 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 9 Chemistry practice quiz has 49 multiple-choice questions on Hydrogen, and 49 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. In the synthesis of ammonia by Haber's process, the equilibrium is favoured by:

   1. High temperature and high pressure
   2. Low temperature and low pressure
   3. High temperature and low pressure
   4. Low temperature and high pressure
   Show answer

   Answer: D. Low temperature and high pressure

   The synthesis of ammonia (N2 + 3H2 <=> 2NH3) is an exothermic reaction. According to Le Chatelier's principle, a lower temperature favours the forward (exothermic) reaction, thus increasing the yield of ammonia. The reaction also involves a decrease in the number of moles (4 moles of reactants to 2 moles of product), so an increase in pressure will shift the equilibrium to the right, favouring the formation of ammonia.

2. What is the primary reason for the unusual position of hydrogen in the periodic table?

   1. Its low atomic number
   2. Its ability to lose one electron to form H⁺, similar to alkali metals
   3. Its ability to gain one electron to form H⁻, similar to halogens
   4. Both B and C
   Show answer

   Answer: D. Both B and C

   Hydrogen's unique placement in the periodic table is due to its dual nature. It can lose one electron to form a cation (H⁺), exhibiting properties similar to alkali metals (Group 1). It can also gain one electron to form an anion (H⁻), resembling halogens (Group 17) in its reactivity. This ability to participate in both types of bonding contributes to its anomalous position.

3. Hydrogen bonding, a strong intermolecular force, occurs between hydrogen and highly electronegative atoms like:

   1. Carbon and Nitrogen
   2. Oxygen, Nitrogen, and Fluorine
   3. Sulfur and Chlorine
   4. Phosphorus and Boron
   Show answer

   Answer: B. Oxygen, Nitrogen, and Fluorine

   Hydrogen bonding is a special type of dipole-dipole interaction that occurs when a hydrogen atom bonded to a highly electronegative atom (like O, N, or F) is attracted to a lone pair of electrons on another electronegative atom in a different molecule or within the same molecule. This phenomenon is crucial in determining the properties of water, ammonia, and HF.

4. The 'autoionization' of hydrogen refers to:

   1. The reaction of hydrogen with itself
   2. The formation of H⁺ and H⁻ ions from a hydrogen molecule
   3. The dissociation of hydrogen into atomic hydrogen
   4. The reversible reaction of hydrogen with oxygen
   Show answer

   Answer: B. The formation of H⁺ and H⁻ ions from a hydrogen molecule

   Autoionization of hydrogen, though extremely rare under normal conditions, refers to the hypothetical or theoretical process where a hydrogen molecule (H₂) spontaneously dissociates into a proton (H⁺) and a hydride ion (H⁻). This is a conceptual idea related to the extreme conditions or theoretical models.

5. The most stable allotrope of hydrogen at room temperature and pressure is:

   1. Ortho-hydrogen
   2. Para-hydrogen
   3. Atomic hydrogen
   4. Metallic hydrogen
   Show answer

   Answer: B. Para-hydrogen

   At room temperature, a mixture of ortho- and para-hydrogen exists, with ortho-hydrogen being more abundant. However, at very low temperatures (below 20 K), para-hydrogen becomes the dominant and more stable form because its nuclear spins are antiparallel, resulting in a lower energy state.

More questions in this quiz

Answers and explanations are in the full quiz.

1. The most abundant isotope of hydrogen is:
2. Heavy water (D₂O) is used as a moderator in nuclear reactors because:
3. Hydrogen peroxide (H₂O₂) acts as both an oxidizing and reducing agent due to:
4. Which of the following methods is LEAST suitable for the laboratory preparation of pure hydrogen gas?
5. The hydride ion (H⁻) is a strong reducing agent because:
6. Which of the following hydrides is NOT an ionic hydride?
7. In the electrolysis of acidified water, the gas evolved at the cathode is:
8. The property of hydrogen that makes it useful as a fuel is its:
9. Which of the following is a FALSE statement about hydrogen?
10. The reaction of hydrogen with oxygen to form water is:
11. What is the role of palladium in the catalytic hydrogenation of alkenes?
12. Which of the following conditions would yield the highest percentage of hydrogen in a sample of methane (CH₄) after reforming?
13. The bond dissociation energy of the H-H bond is approximately:
14. When hydrogen burns in oxygen with a 'pop' sound, it indicates:
15. Which of the following metals reacts with cold water to produce hydrogen gas?
16. The 'water gas shift reaction' involves the conversion of carbon monoxide to carbon dioxide in the presence of steam and a catalyst, producing hydrogen gas. The reaction is:
17. Which statement best describes the oxidation state of hydrogen in metal hydrides like NaH?
18. The production of hydrogen from natural gas through steam reforming is primarily used for:
19. The hydride formed between hydrogen and a non-metal like chlorine (HCl) is classified as a:
20. The density of hydrogen gas at STP is approximately:
21. Which isotope of hydrogen is radioactive?
22. In the Haber process, the catalyst used is typically:
23. The reaction of a metal hydride with water is generally:
24. Which of the following is a characteristic property of ortho-hydrogen compared to para-hydrogen?
25. The volume of hydrogen gas produced at STP when 6.5 g of zinc reacts with excess dilute sulfuric acid is approximately:
26. Which of the following is NOT a method for the production of hydrogen gas?
27. Why is hydrogen considered a 'clean' fuel?
28. The reaction of hydrogen with halogens (e.g., Cl₂) in the presence of sunlight is:
29. Which of the following hydrides is classified as an electron-deficient hydride?
30. In the Mond's process for the purification of nickel, carbon monoxide is used to form nickel tetracarbonyl, and then nickel is recovered by the thermal decomposition of this complex. Hydrogen plays a role in the subsequent recovery of nickel via:
31. The energy required to break the bond in H₂ molecule is known as:
32. Which property of hydrogen makes it difficult to store and transport as a fuel?
33. Deuterium oxide (D₂O) is commonly known as:
34. In the preparation of hydrogen from zinc and dilute sulfuric acid, adding a small amount of copper sulfate to the reaction mixture:
35. Which of the following statements about hydrogen bonding in water is INCORRECT?
36. The primary use of hydrogen in the petrochemical industry is:
37. When hydrogen is passed over heated cupric oxide, it reduces cupric oxide to copper. In this reaction, hydrogen acts as:
38. The atomic radius of hydrogen is comparable to that of:
39. The process of liquefying hydrogen requires:
40. Which of the following statements regarding the bonding in water (H₂O) is primarily influenced by hydrogen?
41. The catalyst used in the Bosch process for the catalytic reduction of nitrogen monoxide (NO) to nitrogen gas, using hydrogen, is typically:
42. When hydrogen burns in air, the product formed is:
43. The bond angle in a water molecule (H₂O) is approximately 104.5°. This deviation from the ideal tetrahedral angle of 109.5° is due to:
44. Hydrogen fuel cells generate electricity through:

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