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Some p-Block Elements JENPAS MCQ & Practice Questions

Practice Some p-Block Elements MCQs for JENPAS Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

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Some p-Block Elements Revision Guide for JENPAS 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 JENPAS 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 Some p-Block Elements, then test recall with mixed MCQs.

What to practise in Some p-Block Elements

Concept Revision

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

Exam-style MCQs

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Performance Practice

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Top 20 Some p-Block Elements MCQs with Answers

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JENPAS Chemistry · Some p-Block Elements · Very Very Hard

1. p-Block reasoning: Boron differs from aluminium mainly because boron is:

  • A. A nonmetal with small size and high ionisation enthalpy
  • B. A typical metal
  • C. Larger than aluminium
  • D. More electropositive than aluminium
Answer: A
Explanation: Boron is small and nonmetallic, unlike heavier Group 13 members.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

2. p-Block reasoning: The inert-pair effect becomes more important down Group 14 and stabilises:

  • A. +2 oxidation state
  • B. +4 oxidation state only
  • C. -4 oxidation state
  • D. +6 oxidation state
Answer: A
Explanation: The ns2 pair becomes less available for bonding down the group.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

3. Boron differs from aluminium mainly because boron is:

  • A. A nonmetal with small size and high ionisation enthalpy
  • B. A typical metal
  • C. Larger than aluminium
  • D. More electropositive than aluminium
Answer: A
Explanation: Boron is small and nonmetallic, unlike heavier Group 13 members.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

4. The inert-pair effect becomes more important down Group 14 and stabilises:

  • A. +2 oxidation state
  • B. +4 oxidation state only
  • C. -4 oxidation state
  • D. +6 oxidation state
Answer: A
Explanation: The ns2 pair becomes less available for bonding down the group.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

5. The first element of Group 13 shows anomalous behaviour mainly due to:

  • A. Low electronegativity
  • B. Presence of d orbitals
  • C. Small size and high ionisation enthalpy
  • D. Large size
Answer: C
Explanation: Boron differs strongly from heavier congeners because of its small size and electronic structure.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

6. JENPAS advanced: Boron differs from aluminium mainly because boron is:

  • A. Larger than aluminium
  • B. More electropositive than aluminium
  • C. A nonmetal with small size and high ionisation enthalpy
  • D. A typical metal
Answer: C
Explanation: Boron is small and nonmetallic, unlike heavier Group 13 members.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

7. JENPAS advanced: The inert-pair effect becomes more important down Group 14 and stabilises:

  • A. -4 oxidation state
  • B. +6 oxidation state
  • C. +2 oxidation state
  • D. +4 oxidation state only
Answer: C
Explanation: The ns2 pair becomes less available for bonding down the group.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

8. JENPAS advanced: The first element of Group 13 shows anomalous behaviour mainly due to:

  • A. Small size and high ionisation enthalpy
  • B. Large size
  • C. Low electronegativity
  • D. Presence of d orbitals
Answer: A
Explanation: Boron differs strongly from heavier congeners because of its small size and electronic structure.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

9. p-Block reasoning: The general valence-shell configuration of Group 13 elements is:

  • A. ns2np3
  • B. ns2np5
  • C. ns2np1
  • D. ns2np2
Answer: C
Explanation: Group 13 elements have three valence electrons with configuration ns2np1.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

10. p-Block reasoning: The general valence-shell configuration of Group 14 elements is:

  • A. ns2np4
  • B. ns2np2
  • C. ns2np1
  • D. ns2np3
Answer: B
Explanation: Group 14 elements possess ns2np2 valence configuration.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

11. p-Block reasoning: Boric acid behaves mainly as a:

  • A. Strong tribasic Brønsted acid
  • B. Strong base
  • C. Neutral salt
  • D. Weak monobasic Lewis acid
Answer: D
Explanation: B(OH)3 accepts OH- from water and acts as a weak Lewis acid.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

12. p-Block reasoning: Diborane contains:

  • A. Metallic bonds
  • B. Only normal two-centre bonds
  • C. Three-centre two-electron bonds
  • D. Only ionic bonds
Answer: C
Explanation: Its bridging B-H-B bonds are electron-deficient 3c-2e bonds.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

13. p-Block reasoning: Carbon shows strong catenation because of:

  • A. Weak C-C bonds
  • B. Absence of valence electrons
  • C. Strong C-C bonds
  • D. Very large atomic size
Answer: C
Explanation: Small carbon atoms form strong covalent C-C bonds.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

14. p-Block reasoning: Maximum covalency of carbon is usually limited to:

  • A. 2
  • B. 4
  • C. 6
  • D. 8
Answer: B
Explanation: Carbon has only 2s and 2p valence orbitals and normally forms up to four covalent bonds.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

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

  • A. ns2np3
  • B. ns2np5
  • C. ns2np1
  • D. ns2np2
Answer: C
Explanation: Group 13 elements have three valence electrons with configuration ns2np1.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

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

  • A. ns2np4
  • B. ns2np2
  • C. ns2np1
  • D. ns2np3
Answer: B
Explanation: Group 14 elements possess ns2np2 valence configuration.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

17. Boric acid behaves mainly as a:

  • A. Strong tribasic Brønsted acid
  • B. Strong base
  • C. Neutral salt
  • D. Weak monobasic Lewis acid
Answer: D
Explanation: B(OH)3 accepts OH- from water and acts as a weak Lewis acid.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

18. Diborane contains:

  • A. Metallic bonds
  • B. Only normal two-centre bonds
  • C. Three-centre two-electron bonds
  • D. Only ionic bonds
Answer: C
Explanation: Its bridging B-H-B bonds are electron-deficient 3c-2e bonds.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

19. Carbon shows strong catenation because of:

  • A. Weak C-C bonds
  • B. Absence of valence electrons
  • C. Strong C-C bonds
  • D. Very large atomic size
Answer: C
Explanation: Small carbon atoms form strong covalent C-C bonds.

JENPAS Chemistry · Some p-Block Elements · Very Very Hard

20. Maximum covalency of carbon is usually limited to:

  • A. 2
  • B. 4
  • C. 6
  • D. 8
Answer: B
Explanation: Carbon has only 2s and 2p valence orbitals and normally forms up to four covalent bonds.

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Some p-Block Elements Practice Tests

Some 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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