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Classification of Elements and Periodicity in Properties WBJEE MCQ & Practice Questions

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Classification of Elements and Periodicity in Properties Revision Guide for WBJEE Chemistry

Classification of Elements and Periodicity in Properties is part of WBJEE Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

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Important Topics

  • Core definitions and principles
  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
  • Exam-style multiple-choice questions
  • Error review and targeted revision

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Top 20 Classification of Elements and Periodicity in Properties MCQs with Answers

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WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

1. Modern periodic law states that properties of elements are periodic functions of their:

  • A. Neutron numbers
  • B. Mass numbers
  • C. Atomic numbers
  • D. Atomic masses
Answer: C
Explanation: Modern periodic law is based on atomic number.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

2. The modern periodic table contains how many groups?

  • A. 32
  • B. 18
  • C. 8
  • D. 16
Answer: B
Explanation: The long-form periodic table has 18 groups.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

3. The modern periodic table contains how many periods?

  • A. 7
  • B. 8
  • C. 18
  • D. 6
Answer: A
Explanation: There are seven horizontal periods.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

4. Elements in the same group generally have similar:

  • A. Atomic masses
  • B. Numbers of shells
  • C. Neutron numbers
  • D. Valence-shell electronic configurations
Answer: D
Explanation: Similar valence configurations produce related chemical properties.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

5. Across a period from left to right, effective nuclear charge generally:

  • A. Remains constant
  • B. Becomes zero
  • C. Increases
  • D. Decreases
Answer: C
Explanation: Nuclear charge increases while shielding changes comparatively little.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

6. Across a period, atomic radius generally:

  • A. First becomes infinite
  • B. Decreases
  • C. Increases
  • D. Remains constant
Answer: B
Explanation: Increasing effective nuclear charge pulls electrons closer.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

7. Down a group, atomic radius generally:

  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Becomes zero
Answer: A
Explanation: Additional electron shells increase atomic size.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

8. The first ionisation enthalpy across a period generally:

  • A. Decreases
  • B. Remains constant
  • C. Becomes negative
  • D. Increases
Answer: D
Explanation: Increasing effective nuclear charge generally raises the energy required to remove an electron.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

9. Down a group, first ionisation enthalpy generally:

  • A. Remains constant
  • B. Doubles exactly
  • C. Decreases
  • D. Increases
Answer: C
Explanation: Larger size and shielding reduce attraction for the outer electron.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

10. Electron gain enthalpy generally becomes more negative across a period because:

  • A. Valence electrons decrease
  • B. Effective nuclear charge increases
  • C. Atomic size increases
  • D. Shielding becomes infinite
Answer: B
Explanation: Greater attraction for an incoming electron usually makes electron gain more favourable.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

11. Electronegativity across a period generally:

  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Becomes zero
Answer: A
Explanation: Higher effective nuclear charge increases attraction for bonding electrons.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

12. Electronegativity down a group generally:

  • A. Increases
  • B. Remains constant
  • C. Becomes infinite
  • D. Decreases
Answer: D
Explanation: Increasing size and shielding reduce bond-electron attraction.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

13. The most electronegative element is:

  • A. Chlorine
  • B. Nitrogen
  • C. Fluorine
  • D. Oxygen
Answer: C
Explanation: Fluorine has the highest electronegativity.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

14. Alkali metals belong to:

  • A. Group 18
  • B. Group 1
  • C. Group 2
  • D. Group 17
Answer: B
Explanation: Group 1 elements are alkali metals.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

15. Alkaline earth metals belong to:

  • A. Group 2
  • B. Group 1
  • C. Group 16
  • D. Group 18
Answer: A
Explanation: Group 2 elements are alkaline earth metals.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

16. Halogens belong to:

  • A. Group 16
  • B. Group 18
  • C. Group 15
  • D. Group 17
Answer: D
Explanation: Group 17 contains the halogens.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

17. Noble gases belong to:

  • A. Group 1
  • B. Group 2
  • C. Group 18
  • D. Group 17
Answer: C
Explanation: Group 18 contains the noble gases.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

18. The general valence configuration of alkali metals is:

  • A. ns2np6
  • B. ns1
  • C. ns2
  • D. ns2np5
Answer: B
Explanation: Group 1 atoms have one valence s electron.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

19. The general valence configuration of alkaline earth metals is:

  • A. ns2
  • B. ns1
  • C. ns2np1
  • D. ns2np6
Answer: A
Explanation: Group 2 atoms have two valence s electrons.

WBJEE Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

20. The general valence configuration of halogens is:

  • A. ns2np4
  • B. ns1
  • C. ns2np6
  • D. ns2np5
Answer: D
Explanation: Halogens have seven valence electrons.

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Classification of Elements and Periodicity in Properties Frequently Asked Questions

How should I prepare Classification of Elements and Periodicity in Properties for WBJEE Chemistry?

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