Q21. Which of the following substances can act as both a reducing agent and an oxidizing agent?
A) NaH
B) H₂
C) H₂O₂
D) HCl
Answer: C) H₂O₂
Explanation: Hydrogen peroxide (H₂O₂) can act both as an oxidizing agent and as a reducing agent, depending on the chemical environment.
Q22. The reaction of water gas (CO + H₂) with steam in the presence of a catalyst to form hydrogen is called:
A) Haber process
B) Bosch process
C) Lane’s process
D) Water-gas shift reaction
Answer: D) Water-gas shift reaction
Explanation: The water-gas shift reaction increases the yield of hydrogen by reacting water gas (CO + H₂) with steam, producing CO₂ and H₂.
Q23. Which of the following is not a property of hydrogen?
A) It has high energy content.
B) It is highly soluble in water.
C) It is the lightest gas.
D) It is non-toxic.
Answer: B) It is highly soluble in water.
Explanation: Hydrogen is only sparingly soluble in water, making this statement incorrect.
Q24. Hydrogen does not react with which of the following under normal conditions?
A) Oxygen
B) Nitrogen
C) Carbon
D) Noble gases
Answer: D) Noble gases
Explanation: Noble gases are chemically inert under normal conditions and do not react with hydrogen.
Q25. Which of the following isotopes of hydrogen is radioactive?
A) Protium
B) Deuterium
C) Tritium
D) All of the above
Answer: C) Tritium
Explanation: Tritium (³H) is radioactive, while protium (¹H) and deuterium (²H) are stable isotopes.
Q26. Hydrogen is collected over water because:
A) It is highly soluble in water
B) It is sparingly soluble in water
C) It reacts with water
D) It has a high density
Answer: B) It is sparingly soluble in water
Explanation: Hydrogen is collected over water because it is only sparingly soluble in water, meaning only a small amount dissolves, allowing the gas to be collected easily.
Q27. The bond dissociation energy of H-H bond in H₂ molecule is:
A) Low
B) Moderate
C) High
D) Zero
Answer: C) High
Explanation: The bond dissociation energy of H-H bond is high, as the bond between the two hydrogen atoms is strong due to its short bond length and high bond energy.
Q28. Hydrogen forms a diatomic molecule (H₂) because:
A) It forms ionic bonds.
B) It shares one electron with another hydrogen atom to complete its duplet.
C) It prefers to remain monatomic.
D) It forms a triple bond with another hydrogen atom.
Answer: B) It shares one electron with another hydrogen atom to complete its duplet.
Explanation: Hydrogen shares one electron with another hydrogen atom, forming a covalent bond and completing the duplet.
Q29. Hydrogen burns in air with a:
A) Blue flame
B) Yellow flame
C) Colorless flame
D) Red flame
Answer: C) Colorless flame
Explanation: Hydrogen burns with a pale blue or almost colorless flame in air, producing water as the only byproduct.
Q30. Hydrogen gas can reduce metal oxides to their respective metals at high temperatures. This property is due to its:
A) High reactivity
B) Reducing nature
C) Low atomic mass
D) High calorific value
Answer: B) Reducing nature
Explanation: Hydrogen is a good reducing agent and can reduce metal oxides like CuO to their respective metals at high temperatures.
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