The p-Block Elements Practice Questions

Class 12 · Chemistry · 2986 free MCQs with instant results and detailed explanations.

2986

Total

952

Easy

1423

Medium

611

Hard

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Topics in The p-Block Elements

Group 15 Elements 763

Group 16 Elements 688

Group 18 Elements 835

Group 17 Elements 700

Sample Questions from The p-Block Elements

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Easy

Which of the following elements is not a member of Group 15 in the periodic table?

A. Phosphorus

B. Arsenic

C. Boron

D. Nitrogen

Show Answer & Explanation

Correct Answer: C

Boron is a Group 13 element, while Phosphorus, Arsenic, and Nitrogen belong to Group 15.

Easy

Which of the following oxide of phosphorus is known as 'white phosphorus'?

A. P2O5

B. P4O6

C. P4O10

D. P4O8

Show Answer & Explanation

Correct Answer: B

White phosphorus corresponds to the molecular formula P4, which reacts to form P4O6 and P4O10.

Easy

In which of the following compounds does phosphorus exhibit its highest oxidation state?

A. PH3

B. PCl5

C. H3PO4

D. P2O5

Show Answer & Explanation

Correct Answer: D

In P2O5, phosphorus has an oxidation state of +5, which is its highest oxidation state.

Medium

Which of the following is a property of nitrogen that differentiates it from other group 15 elements?

A. It forms strong hydrogen bonds

B. It exists as a diatomic molecule

C. It is a liquid at room temperature

D. It can form a +5 oxidation state

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Correct Answer: B

Nitrogen exists as a diatomic molecule (N2) under normal conditions, unlike other group 15 elements.

Medium

Which of the following oxides of phosphorus is known as phosphorus pentoxide?

A. P2O3

B. P2O5

C. PO

D. P4O10

Show Answer & Explanation

Correct Answer: B

Phosphorus pentoxide refers to P2O5, which is commonly used as a dehydrating agent.

Medium

Which group 15 element is most likely to form a stable +5 oxidation state?

A. Arsenic

B. Antimony

C. Nitrogen

D. Phosphorus

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Correct Answer: D

Phosphorus can commonly exhibit a +5 oxidation state in compounds like phosphoric acid.

Medium

Which of the following compounds is an example of a nitrogenous base?

A. NH3

B. N2O

C. HNO3

D. NCl3

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Correct Answer: A

Ammonia (NH3) acts as a nitrogenous base by accepting protons.

Hard

Which of the following compounds has the highest stability in Group 15 elements?

A. PH3

B. N2H4

C. AsH3

D. SbH3

Show Answer & Explanation

Correct Answer: B

N2H4 (hydrazine) is a stable compound due to its molecular structure, while the other hydrides become less stable down the group.

Hard

Which of the following allotropes of nitrogen is the most stable at room temperature?

A. N2

B. N3

C. N4

D. N6

Show Answer & Explanation

Correct Answer: A

N2 is the most stable allotrope of nitrogen due to its triple bond, which makes it inert under normal conditions.

Q10

Hard

Which of the following statements about arsenic is false?

A. It is a metalloid.

B. It has a higher melting point than phosphorus.

C. It commonly forms +5 oxidation state compounds.

D. It is a noble gas.

Show Answer & Explanation

Correct Answer: D

Arsenic is a metalloid, not a noble gas. Noble gases are in Group 18, while arsenic is in Group 15.

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The p-Block Elements — Class 12 Chemistry Practice Questions Online

This page contains 2986 practice MCQs for the chapter The p-Block Elements in Class 12 Chemistry. The questions are organized by difficulty — 952 easy, 1423 medium, 611 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.