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Atomic Size and Valency Trends Class 11 Chemistry MCQs with Answers
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CBSE Class 11 Chemistry Online Quiz – Atomic Size and Periodic Trends
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Free Online Test: Atomic Size and Valency Trends Class 11 Chemistry
Introduction Paragraph (150–200 words)
The CBSE Class 11 Chemistry MCQs on “Atomic Size and Valency Trends” are designed to help students thoroughly understand periodic variations in atomic and molecular properties. This topic, from Chapter 3: Classification of Elements and Periodicity in Properties, explores how atomic radii, ionic size, and valency change across periods and down groups in the periodic table.
Our online practice test is carefully curated as per the latest NCERT syllabus, focusing on concepts like effective nuclear charge, electron shielding, isoelectronic species, and variable valency. Each question includes instant feedback and detailed explanations to strengthen conceptual clarity and problem-solving accuracy.
These MCQs are ideal for CBSE Class 11 board exam preparation and for aspirants of competitive exams like JEE and NEET. By attempting this timed quiz, students can improve their speed, accuracy, and confidence while mastering periodic trends — a core concept in physical chemistry.
Sample MCQs (with Answers and Explanations)
Q1. Across a period, atomic size generally:
A) Increases B) Decreases C) Remains same D) Varies irregularly
Answer: B) Decreases
Explanation: With increasing nuclear charge across a period, electrons are pulled closer to the nucleus, reducing atomic size.
Q2. Down a group, atomic size:
A) Increases B) Decreases C) Stays same D) First decreases then increases
Answer: A) Increases
Explanation: Additional electron shells are added down a group, increasing the atomic radius.
Q3. Cations are generally ______ than their parent atoms.
A) Larger B) Smaller C) Equal D) Unpredictable
Answer: B) Smaller
Explanation: Cations lose electrons, decreasing electron repulsion and pulling the remaining electrons closer to the nucleus.
Q4. Which element shows variable valency due to d-electrons?
A) Na B) Fe C) Ne D) Al
Answer: B) Fe
Explanation: Iron exhibits variable valency (+2 and +3) because of its partially filled d-orbitals.
Q5. Valency of nitrogen in ammonia (NH₃) is:
A) 1 B) 2 C) 3 D) 5
Answer: C) 3
Explanation: Nitrogen shares three electrons with hydrogen to form three covalent bonds, showing a valency of 3.