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Classification of Elements and Periodicity in Properties JEE Main MCQ & Practice Questions

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Classification of Elements and Periodicity in Properties Revision Guide for JEE Main Chemistry

Classification of Elements and Periodicity in Properties is part of JEE Main 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

These public questions are selected from the exact Classification of Elements and Periodicity in Properties chapter, screened for topic relevance and deduplicated so repeated versions of the same MCQ are not shown publicly. Use them for quick revision, then sign in to attempt the complete test experience with more questions, results and performance review.

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

1. Set-A concept: Modern periodic law states that the physical and chemical properties of elements are periodic functions of their:

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

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

2. Set-A concept: The modern periodic table contains how many periods?

  • A. 32
  • B. 7
  • C. 8
  • D. 18
Answer: B
Explanation: There are seven horizontal periods.

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

3. Set-A concept: The modern periodic table contains how many groups?

  • A. 18
  • B. 8
  • C. 7
  • D. 32
Answer: A
Explanation: There are eighteen vertical groups.

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

4. Set-A concept: The s-block primarily contains elements of:

  • A. Groups 3 to 12
  • B. Groups 13 to 18
  • C. Only f-block
  • D. Groups 1 and 2
Answer: D
Explanation: The differentiating electron enters an s orbital.

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

5. Set-A concept: The p-block primarily contains elements of:

  • A. Groups 3 to 12
  • B. Only lanthanoids
  • C. Groups 13 to 18
  • D. Groups 1 and 2
Answer: C
Explanation: The differentiating electron enters a p orbital.

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

6. Set-A concept: Transition elements belong primarily to the:

  • A. noble-gas block
  • B. d-block
  • C. s-block
  • D. p-block
Answer: B
Explanation: Their differentiating electrons enter d orbitals.

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

7. Set-A concept: Lanthanoids and actinoids are collectively called:

  • A. Inner transition elements
  • B. Alkali metals
  • C. Halogens
  • D. Noble gases
Answer: A
Explanation: They constitute the f-block or inner-transition series.

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

8. Set-A concept: The general valence configuration of Group 1 elements is:

  • A. ns2
  • B. ns2np1
  • C. ns2np5
  • D. ns1
Answer: D
Explanation: Alkali metals have one valence s electron.

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

9. Set-A concept: The general valence configuration of Group 2 elements is:

  • A. ns2np2
  • B. ns2np6
  • C. ns2
  • D. ns1
Answer: C
Explanation: Alkaline earth metals have two valence s electrons.

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

10. Set-A concept: The general valence configuration of Group 17 elements is:

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

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

11. Set-A concept: Across a period, effective nuclear charge generally:

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

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

12. Set-A concept: Across a period, atomic radius generally:

  • A. Increases
  • B. Remains constant
  • C. First increases then becomes infinite
  • D. Decreases
Answer: D
Explanation: Increasing effective nuclear charge contracts the electron cloud.

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

13. Set-A concept: Down a group, atomic radius generally:

  • A. Remains constant
  • B. Becomes zero
  • C. Increases
  • D. Decreases
Answer: C
Explanation: Additional electron shells are added down a group.

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

14. Set-A concept: Among Li, Na, K and Rb, the largest atomic radius is:

  • A. Li
  • B. Rb
  • C. K
  • D. Na
Answer: B
Explanation: Atomic radius increases down Group 1.

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

15. Set-A concept: Among Na, Mg, Al and Si, the largest atomic radius is generally:

  • A. Na
  • B. Mg
  • C. Al
  • D. Si
Answer: A
Explanation: Atomic size decreases left to right across Period 3.

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

16. Set-A concept: A cation is generally compared with its parent atom:

  • A. Larger
  • B. Exactly equal
  • C. Always twice as large
  • D. Smaller
Answer: D
Explanation: Electron loss lowers repulsion and may remove the valence shell.

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

17. Set-A concept: An anion is generally compared with its parent atom:

  • A. Exactly equal
  • B. Always half as large
  • C. Larger
  • D. Smaller
Answer: C
Explanation: Extra electrons increase electron-electron repulsion.

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

18. Set-A concept: Among the isoelectronic species O2-, F-, Na+ and Mg2+, the smallest is:

  • A. O2-
  • B. Mg2+
  • C. Na+
  • D. F-
Answer: B
Explanation: For isoelectronic species, greater nuclear charge means smaller radius.

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

19. Set-A concept: Among the isoelectronic species O2-, F-, Na+ and Mg2+, the largest is:

  • A. O2-
  • B. F-
  • C. Na+
  • D. Mg2+
Answer: A
Explanation: O2- has the lowest nuclear charge among these ten-electron species.

JEE Main Chemistry · Classification of Elements and Periodicity in Properties · Very Very Hard

20. Set-A concept: Across a period, first ionisation enthalpy generally:

  • A. Decreases
  • B. Remains constant
  • C. Becomes negative
  • D. Increases
Answer: D
Explanation: Increasing effective nuclear charge makes electron removal harder.

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Classification of Elements and Periodicity in Properties Practice Tests

Classification of Elements and Periodicity in Properties Frequently Asked Questions

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