Q. What is the common oxidation state of sulfur in sulfuric acid (H2SO4)? (2022)
Solution
In sulfuric acid, sulfur has an oxidation state of +6.
Correct Answer: C — +6
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Q. What is the primary oxidation state of carbon in carbon dioxide (CO2)? (2020)
Solution
In carbon dioxide, carbon has an oxidation state of +4.
Correct Answer: B — +4
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Q. What is the primary oxidation state of lead in lead(II) oxide (PbO)? (2019)
Solution
In lead(II) oxide, lead has an oxidation state of +2.
Correct Answer: A — +2
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Q. What is the primary oxidation state of nitrogen in ammonia (NH3)? (2021)
Solution
In ammonia, nitrogen has an oxidation state of -3.
Correct Answer: A — -3
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Q. Which of the following compounds contains a p-block element in its highest oxidation state? (2023)
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A.
SO2
-
B.
PCl5
-
C.
Na2O
-
D.
MgCl2
Solution
In PCl5, phosphorus is in its highest oxidation state of +5.
Correct Answer: B — PCl5
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Q. Which of the following compounds is an example of a covalent compound formed by a p-block element? (2022)
-
A.
NaCl
-
B.
MgO
-
C.
SiCl4
-
D.
CaF2
Solution
SiCl4 is a covalent compound formed by silicon, a p-block element.
Correct Answer: C — SiCl4
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Q. Which of the following elements is known for forming a stable +3 oxidation state? (2023)
-
A.
Aluminium
-
B.
Gallium
-
C.
Indium
-
D.
Thallium
Solution
Aluminium commonly forms a stable +3 oxidation state in its compounds.
Correct Answer: A — Aluminium
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Q. Which of the following elements is known for forming a stable +4 oxidation state? (2023)
-
A.
Carbon
-
B.
Silicon
-
C.
Germanium
-
D.
Tin
Solution
Tin (Sn) is known for forming a stable +4 oxidation state.
Correct Answer: D — Tin
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Q. Which of the following is a common allotrope of phosphorus? (2022)
-
A.
Red phosphorus
-
B.
Black phosphorus
-
C.
White phosphorus
-
D.
All of the above
Solution
Phosphorus exists in several allotropes, including red, black, and white phosphorus.
Correct Answer: D — All of the above
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Q. Which of the following is a common property of halogens? (2023)
-
A.
They are all gases at room temperature
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B.
They have low electronegativity
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C.
They form diatomic molecules
-
D.
They are metals
Solution
Halogens commonly exist as diatomic molecules (e.g., Cl2, F2).
Correct Answer: C — They form diatomic molecules
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Q. Which of the following is a common use of sulfur? (2022)
-
A.
Fertilizers
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B.
Explosives
-
C.
Rubber production
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D.
All of the above
Solution
Sulfur is used in fertilizers, explosives, and rubber production.
Correct Answer: D — All of the above
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Q. Which of the following is not a property of nitrogen? (2023)
-
A.
Colorless gas
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B.
Odorless
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C.
Supports combustion
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D.
Diatomic molecule
Solution
Nitrogen is colorless, odorless, and diatomic, but it does not support combustion.
Correct Answer: C — Supports combustion
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Q. Which of the following oxides is amphoteric? (2019)
-
A.
Na2O
-
B.
MgO
-
C.
Al2O3
-
D.
SiO2
Solution
Al2O3 is an amphoteric oxide, reacting with both acids and bases.
Correct Answer: C — Al2O3
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