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The p-Block Elements CBSE Class 11 MCQ & Practice Questions

Practice The p-Block Elements MCQs for CBSE Class 11 Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

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The p-Block Elements Revision Guide for CBSE Class 11 Chemistry

p-Block Elements covers periodic trends, structures, oxidation states and important compounds of groups 13 to 18 depending on the syllabus. Questions often test trends together with exceptions.

For CBSE Class 11 Chemistry, organise revision group-wise and compare oxidation states, acidic or basic character, anomalous behaviour, structures and important reactions.

Important Topics

  • Group-wise periodic trends
  • Anomalous behaviour of first elements
  • Oxidation states and inert-pair effect
  • Structures of important compounds
  • Acidic and basic character
  • Important reactions and uses

Revision Tip

Create a one-page summary of trends, structures, reactions, exceptions and key terminology for The p-Block Elements, then test recall with mixed MCQs.

What to practise in The p-Block Elements

Concept Revision

Revise definitions, principles, equations, trends and core ideas from The p-Block Elements before attempting MCQs.

Exam-style MCQs

Use chapter-focused multiple-choice practice to improve accuracy, recall and application for CBSE Class 11 Chemistry.

Performance Practice

Attempt ChemNexa tests, review results and return to weak areas for another round of targeted revision.

Top 11 The p-Block Elements MCQs with Answers

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CBSE Class 11 Chemistry · The p-Block Elements · Very Very Hard

1. Boron differs from the other Group 13 elements mainly because of its:

  • A. Large atomic size
  • B. Small size and absence of d-orbitals
  • C. Low ionisation enthalpy
  • D. Metallic character
Answer: B
Explanation: Boron is very small, has high ionisation enthalpy, and lacks vacant d-orbitals.

CBSE Class 11 Chemistry · The p-Block Elements · Very Very Hard

2. Which Group 13 element forms the most covalent trihalide?

  • A. Boron
  • B. Aluminium
  • C. Gallium
  • D. Thallium
Answer: A
Explanation: Small, highly polarising boron forms strongly covalent compounds such as BCl₃.

CBSE Class 11 Chemistry · The p-Block Elements · Very Very Hard

3. The general valence-shell configuration of Group 13 elements is:

  • A. ns²np¹
  • B. ns²np²
  • C. ns²np³
  • D. ns¹
Answer: A
Explanation: Group 13 elements possess three valence electrons with configuration ns²np¹.

CBSE Class 11 Chemistry · The p-Block Elements · Very Very Hard

4. The general valence-shell configuration of Group 14 elements is:

  • A. ns²np¹
  • B. ns²np²
  • C. ns²np⁴
  • D. ns²
Answer: B
Explanation: Group 14 elements possess four valence electrons with configuration ns²np².

CBSE Class 11 Chemistry · The p-Block Elements · Very Very Hard

5. The stability of the +1 oxidation state in Group 13 generally:

  • A. Decreases down the group
  • B. Increases down the group
  • C. Remains constant
  • D. Is maximum for boron
Answer: B
Explanation: The inert-pair effect becomes stronger down the group, stabilising the +1 state.

CBSE Class 11 Chemistry · The p-Block Elements · Very Very Hard

6. BF₃ behaves as a Lewis acid because boron:

  • A. Has a lone pair
  • B. Has an incomplete octet
  • C. Has a negative charge
  • D. Donates an electron pair
Answer: B
Explanation: Boron has only six electrons around it and can accept an electron pair.

CBSE Class 11 Chemistry · The p-Block Elements · Very Very Hard

7. The shape of BF₃ is:

  • A. Trigonal pyramidal
  • B. Trigonal planar
  • C. Tetrahedral
  • D. Bent
Answer: B
Explanation: Boron is sp² hybridised in BF₃, giving trigonal planar geometry.

CBSE Class 11 Chemistry · The p-Block Elements · Very Very Hard

8. Borax has the formula:

  • A. Na₂B₄O₇·10H₂O
  • B. H₃BO₃
  • C. B₂H₆
  • D. NaBO₂
Answer: A
Explanation: Borax is sodium tetraborate decahydrate.

CBSE Class 11 Chemistry · The p-Block Elements · Very Very Hard

9. The general valence-shell configuration of Group 14 is:

  • A. ns²np¹
  • B. ns²np²
  • C. ns²np³
  • D. ns²np⁴
Answer: B
Explanation: Group 14 elements have four valence electrons.

CBSE Class 11 Chemistry · The p-Block Elements · Very Very Hard

10. The maximum tendency for catenation in Group 14 is shown by:

  • A. Silicon
  • B. Carbon
  • C. Germanium
  • D. Tin
Answer: B
Explanation: Carbon forms the strongest element-element bonds in Group 14.

CBSE Class 11 Chemistry · The p-Block Elements · Very Very Hard

11. The stability of the +2 oxidation state in Group 14 generally:

  • A. Decreases down the group
  • B. Increases down the group
  • C. Remains constant
  • D. Is zero for lead
Answer: B
Explanation: The inert-pair effect stabilises the lower +2 oxidation state down the group.

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The p-Block Elements Practice Tests

The p-Block Elements Frequently Asked Questions

How should I memorise p-Block Chemistry?

Use comparison tables by group and focus on trends, important exceptions, structures and reactions instead of memorising disconnected facts.

Why are exceptions important in p-Block questions?

Small size, high electronegativity, absence of d orbitals in second-period elements and inert-pair effects create frequently tested deviations from simple trends.

What is a good revision method for p-Block?

Revise one group at a time, write the common oxidation states and key compounds, then immediately solve targeted MCQs.

Continue with another chapter to build connected concepts and strengthen your overall Chemistry preparation.

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