Inorganic Chemistry - p-Block Elements for Competitive Exams

Inorganic Chemistry - p-Block Elements

Q. What is the common oxidation state of sulfur in sulfuric acid (H2SO4)? (2022)

A. +2
B. +4
C. +6
D. 0

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)

A. +2
B. +4
C. 0
D. -4

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)

A. +2
B. +4
C. 0
D. -2

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)

A. -3
B. +1
C. +3
D. +5

Solution

In ammonia, nitrogen has an oxidation state of -3.

Correct Answer: A — -3

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Q. What is the primary reason for the increase in ionization energy across a period in p-block elements? (2023)

A. Increase in atomic size
B. Increase in nuclear charge
C. Decrease in shielding effect
D. Increase in electron affinity

Solution

The increase in nuclear charge across a period leads to higher ionization energy.

Correct Answer: B — Increase in nuclear charge

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Q. Which of the following compounds contains a p-block element in its highest oxidation state? (2023)

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
B. They have low electronegativity
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
B. Explosives
C. Rubber production
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
B. Odorless
C. Supports combustion
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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Inorganic Chemistry - p-Block Elements

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