Inorganic Chemistry - p-Block Elements (Class 12)
Q. What is the primary oxidation state of nitrogen in nitric acid (HNO3)? (2023)
Solution
In nitric acid, nitrogen has an oxidation state of +5.
Correct Answer: C — +5
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Q. What is the primary use of boron in the industry? (2023)
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A.
Fertilizers
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B.
Glass production
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C.
Detergents
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D.
Pharmaceuticals
Solution
Boron is primarily used in the production of glass and ceramics.
Correct Answer: B — Glass production
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Q. What is the primary use of sulfuric acid (H2SO4) in industry? (2019)
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A.
Fertilizer production
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B.
Battery acid
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C.
Cleaning agent
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D.
Food preservative
Solution
Sulfuric acid is primarily used in the production of fertilizers.
Correct Answer: A — Fertilizer production
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Q. Which of the following compounds contains a coordinate bond? (2023)
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A.
NH3
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B.
H2O
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C.
CO
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D.
NaCl
Solution
Carbon monoxide (CO) contains a coordinate bond between carbon and oxygen.
Correct Answer: C — CO
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Q. Which of the following compounds is an example of a covalent compound? (2019)
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A.
NaCl
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B.
MgO
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C.
SiO2
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D.
CaF2
Solution
SiO2 (silicon dioxide) is a covalent compound formed by the sharing of electrons between silicon and oxygen.
Correct Answer: C — SiO2
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Q. Which of the following is a characteristic property of noble gases? (2019)
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A.
High reactivity
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B.
Colorless and odorless
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C.
Forming ionic bonds
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D.
High boiling points
Solution
Noble gases are colorless and odorless under standard conditions.
Correct Answer: B — Colorless and odorless
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Q. Which of the following is the most acidic oxide? (2022)
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A.
P2O5
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B.
SO2
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C.
CO2
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D.
SiO2
Solution
P2O5 (phosphorus pentoxide) is the most acidic oxide among the given options.
Correct Answer: A — P2O5
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