Q61. The chemical formula of heavy water is:
A) H₂O
B) D₂O
C) T₂O
D) DHO
Answer: B) D₂O
Explanation: Heavy water consists of deuterium (D) instead of protium (H), making its formula D₂O.
Q62. Which of the following is a use of hydrogen in the chemical industry?
A) Production of ammonia
B) As a refrigerant
C) Manufacture of nitric acid
D) Production of sulfuric acid
Answer: A) Production of ammonia
Explanation: Hydrogen is used in the Haber process for the production of ammonia, which is a key industrial application.
Q64. Hydrogen reacts with chlorine in the presence of sunlight to produce:
A) H₂O
B) HCl
C) Cl₂O
D) ClO₃⁻
Answer: B) HCl
Explanation: Hydrogen reacts explosively with chlorine in the presence of sunlight to form hydrogen chloride (HCl).
Q65. Which of the following metals does not liberate hydrogen from acids?
A) Zinc
B) Copper
C) Iron
D) Magnesium
Answer: B) Copper
Explanation: Copper does not liberate hydrogen from dilute acids because it is less reactive than hydrogen in the electrochemical series.
Q66. The property of hydrogen responsible for its reducing nature is:
A) Low ionization enthalpy
B) High electronegativity
C) Tendency to lose electrons
D) Ability to gain protons
Answer: C) Tendency to lose electrons
Explanation: Hydrogen acts as a reducing agent because it can lose electrons and reduce other substances.
Q67. The process used for the large-scale production of hydrogen by passing steam over red-hot iron is called:
A) Haber process
B) Bosch process
C) Lane’s process
D) Contact process
Answer: C) Lane’s process
Explanation: Lane’s process involves passing steam over red-hot iron to produce hydrogen gas and iron oxide.
Q68. Hydrogen can act as a reducing agent with:
A) Oxygen
B) Carbon dioxide
C) Nitrogen
D) All of the above
Answer: D) All of the above
Explanation: Hydrogen acts as a reducing agent with substances like oxygen, carbon dioxide, and nitrogen to form water, hydrocarbons, and ammonia, respectively.
Q69. The use of hydrogen in space rockets is due to its:
A) Low reactivity
B) High reactivity
C) Low energy content
D) High energy content
Answer: D) High energy content
Explanation: Hydrogen has a high energy content, making it an excellent fuel for space rockets where high energy is required.
Q70. In which of the following compounds does hydrogen exhibit a negative oxidation state?
A) H₂O
B) CH₄
C) H₂SO₄
D) H₂O₂
Answer: B) CH₄
Explanation: In methane (CH₄), hydrogen has an oxidation state of -1, as it forms a bond with a less electronegative element (carbon).
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