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Classification of Elements and Periodicity in Properties WBCHSE Class 11 MCQ & Practice Questions

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Classification of Elements and Periodicity in Properties Revision Guide for WBCHSE Class 11 Chemistry

Classification of Elements and Periodicity in Properties is part of WBCHSE Class 11 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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Top 20 Classification of Elements and Periodicity in Properties MCQs with Answers

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WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

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

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

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

2. The modern periodic table contains:

  • A. 16 groups and 7 periods
  • B. 18 groups and 7 periods
  • C. 8 groups and 7 periods
  • D. 18 groups and 8 periods
Answer: B
Explanation: The long-form periodic table has 18 vertical groups and 7 horizontal periods.

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

3. Elements in the same group generally have similar chemical properties because they have similar:

  • A. Valence-shell electronic configurations
  • B. Atomic masses
  • C. Numbers of shells
  • D. Nuclear masses
Answer: A
Explanation: Group members usually share analogous valence configurations.

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

4. The period number of a main-group element generally corresponds to its:

  • A. Number of valence electrons
  • B. Atomic mass
  • C. Number of neutrons
  • D. Highest principal quantum number
Answer: D
Explanation: The highest occupied principal shell indicates the period.

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

5. The s-block consists primarily of elements whose differentiating electron enters:

  • A. A d orbital
  • B. An f orbital
  • C. An s orbital
  • D. A p orbital
Answer: C
Explanation: The last electron of s-block elements enters an s subshell.

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

6. The p-block consists primarily of elements whose differentiating electron enters:

  • A. An f orbital
  • B. A p orbital
  • C. An s orbital
  • D. A d orbital
Answer: B
Explanation: The last electron of p-block elements enters a p subshell.

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

7. Transition elements belong primarily to the:

  • A. d-block
  • B. s-block
  • C. p-block
  • D. Noble-gas block
Answer: A
Explanation: Transition series arise from progressive filling of d orbitals.

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

8. Inner-transition elements involve progressive filling of:

  • A. p orbitals
  • B. s orbitals only
  • C. d orbitals only
  • D. f orbitals
Answer: D
Explanation: Lanthanides and actinides involve f-subshell filling.

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

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

  • A. Remains exactly constant
  • B. Becomes zero
  • C. Increases
  • D. Decreases
Answer: C
Explanation: Nuclear charge rises while shielding does not fully compensate.

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

10. Across a period, atomic radius generally:

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

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

11. 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.

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

12. A cation is generally:

  • A. Larger than its parent atom
  • B. Exactly equal in size
  • C. Always twice as large
  • D. Smaller than its parent atom
Answer: D
Explanation: Electron loss reduces repulsion and may remove the outer shell.

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

13. An anion is generally:

  • A. Always equal in size
  • B. Without electrons
  • C. Larger than its parent atom
  • D. Smaller than its parent atom
Answer: C
Explanation: Added electrons increase electron-electron repulsion.

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

14. In an isoelectronic series, radius generally decreases as:

  • A. Mass number increases only
  • B. Nuclear charge increases
  • C. Nuclear charge decreases
  • D. Electron number increases while Z fixed
Answer: B
Explanation: With the same electron count, larger nuclear charge pulls electrons inward more strongly.

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

15. Among Na+, Mg2+ and Al3+, the smallest ion is:

  • A. Al3+
  • B. Na+
  • C. Mg2+
  • D. All equal
Answer: A
Explanation: All are isoelectronic; Al3+ has the greatest nuclear charge.

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

16. Ionisation enthalpy is the energy required to remove an electron from:

  • A. A solid lattice only
  • B. A liquid atom only
  • C. A nucleus
  • D. An isolated gaseous atom
Answer: D
Explanation: Ionisation enthalpy is defined for isolated gaseous species.

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

17. Across a period, first ionisation enthalpy generally:

  • A. Remains zero
  • B. Is independent of atomic number
  • C. Increases
  • D. Decreases
Answer: C
Explanation: Increasing effective nuclear charge generally binds valence electrons more strongly.

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

18. Down a group, first ionisation enthalpy generally:

  • A. Doubles every period
  • B. Decreases
  • C. Increases
  • D. Remains constant
Answer: B
Explanation: Greater size and shielding make electron removal easier.

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

19. The second ionisation enthalpy is generally:

  • A. Greater than the first
  • B. Less than the first always
  • C. Equal to zero
  • D. Identical to first
Answer: A
Explanation: Removing an electron from a positively charged ion requires more energy.

WBCHSE Class 11 Chemistry · Classification of Elements and Periodicity in Properties · Very Hard

20. A very large jump between successive ionisation enthalpies indicates:

  • A. Atomic radius is zero
  • B. The atom has no nucleus
  • C. Electron gain is exothermic
  • D. Removal has begun from an inner-shell configuration
Answer: D
Explanation: After all valence electrons are removed, the next electron is a tightly bound core electron.

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