Class 11 Chemistry — Chapter 3: Classification of Elements and Periodicity
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Practise Class 11 Chemistry Chapter 3, "Classification of Elements and Periodicity", with 90 NCERT-aligned multiple-choice questions. The set is split into 30 Easy, 30 Medium and 30 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
"Classification of Elements and Periodicity" is one of the chapters where reactions, named concepts, and balanced numerical work really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Classification of Elements and Periodicity, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 11 Chemistry mastery score. A few sample questions are shown below; sign in free to practise all 90.
Key concepts: Classification of Elements and Periodicity (Class 11 Chemistry)
This chapter covers the modern periodic table, periodic trends, and how electronic configuration explains the periodicity of properties.
- Modern periodic law
- Properties of elements are a periodic function of their atomic numbers (not atomic masses).
- Blocks & periods
- Elements are arranged in s, p, d and f blocks by the subshell being filled; 7 periods and 18 groups.
- Atomic radius
- Decreases across a period (rising nuclear charge) and increases down a group (new shells).
- Ionisation & electron gain enthalpy
- Ionisation enthalpy rises across a period; electron gain enthalpy becomes more negative (halogens most).
- Electronegativity
- Increases across a period and decreases down a group; fluorine is the most electronegative element.
💡 Exam tips for Classification of Elements and Periodicity
- Across a period: size ↓, ionisation energy ↑, electronegativity ↑. Down a group: the reverse.
- Anomalies in ionisation energy (e.g. N > O) come from the stability of half-filled subshells.
Sample questions
Modern periodic table is arranged by:
Moseley's law: properties are periodic functions of Z.
Down a group, atomic radius:
More shells added.
Most electronegative element:
F has highest Pauling electronegativity (3.98).
Classification of Elements and Periodicity — FAQs
What are the key concepts in Class 11 Chemistry Classification of Elements and Periodicity?+
This chapter covers the modern periodic table, periodic trends, and how electronic configuration explains the periodicity of properties. Key ideas include Modern periodic law, Blocks & periods, Atomic radius, Ionisation & electron gain enthalpy, Electronegativity.
What does Class 11 Chemistry Chapter 3 (Classification of Elements and Periodicity) cover on XamBaaz?+
It covers 90 NCERT-aligned MCQs on "Classification of Elements and Periodicity" — 30 Easy, 30 Medium and 30 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
Are these "Classification of Elements and Periodicity" questions free to practise?+
Yes — sign in with Google to practise "Classification of Elements and Periodicity" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Classification of Elements and Periodicity" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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