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Hello students, we are providing case study questions for class 11 Chemistry. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 11 Chemistry. In this article, you will find case study questions for cbse class 11 Chemistry chapter 3 Classification of Elements and Periodicity in Properties.
| Chapter | Classification of Elements and Periodicity in Properties |
| Type of Questions | Case Study Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 11 |
| Subject | Chemistry |
| Useful for | Class 11 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 11 Chemistry Chapterwise Case Study |
Case Study Questions on Classification of Elements and Periodicity in Properties
Case Study Question 1
Passage:
A teacher displayed the modern periodic table in the classroom. She explained how elements in the same group have similar chemical properties due to the same number of valence electrons, while elements in a period show trends in atomic radius, ionisation enthalpy, and electronegativity. The class was asked to compare Na, Mg, and Al, and also F, Cl, and Br in terms of these trends.
Q1. Which of the following shows the correct trend in atomic size across a period (Na → Al)?
(a) Increases
(b) Decreases
(c) Remains the same
(d) First increases then decreases
Answer: (b) Decreases
Explanation: Atomic size decreases across a period due to increased nuclear charge, pulling electrons closer.
Q2. Among F, Cl, and Br, which has the highest electron affinity?
(a) F
(b) Cl
(c) Br
(d) All are equal
Answer: (b) Cl
Explanation: Although F is more electronegative, electron-electron repulsion in its small size reduces its affinity. Cl has highest electron affinity among all elements.
Q3. Which of the following elements has the highest ionisation enthalpy?
(a) Na
(b) Mg
(c) Al
(d) F
Answer: (d) F
Explanation: Ionisation enthalpy increases across a period and decreases down a group. Fluorine has the smallest size and strongest nuclear hold on electrons.
Case Study Question 2
Passage:
A student is given three elements:
- X (atomic number 11)
- Y (atomic number 17)
- Z (atomic number 18)
She is asked to predict their positions in the modern periodic table and deduce their metallic or non-metallic nature based on electronic configurations.
Q1. Which group and period does element X belong to?
(a) Group 1, Period 3
(b) Group 2, Period 2
(c) Group 17, Period 2
(d) Group 1, Period 2
Answer: (a) Group 1, Period 3
Explanation: Atomic number 11 → Na, configuration: 2,8,1 → Group 1 (alkali metals), 3rd period
Q2. Which element is a noble gas?
(a) X
(b) Y
(c) Z
(d) Both Y and Z
Answer: (c) Z
Explanation: Atomic number 18 = Argon, a noble gas (Group 18)
Q3. Which of the three elements is expected to be most reactive?
(a) X
(b) Y
(c) Z
(d) Cannot be determined
Answer: (b) Y
Explanation: Y (atomic number 17 = Chlorine) is a highly reactive non-metal, needs only 1 electron to complete octet.
Case Study Question 3
Passage:
In the modern periodic table, properties such as atomic size, ionisation energy, and electronegativity vary in predictable ways. However, there are exceptions, such as the first ionisation energy of Oxygen being lower than Nitrogen, and the electron affinity of Fluorine being less than Chlorine.
Q1. Why is ionisation enthalpy of oxygen less than nitrogen despite oxygen being to the right?
(a) O has higher atomic size
(b) N has lower electronegativity
(c) N has half-filled stable configuration
(d) O has filled orbitals
Answer: (c) N has half-filled stable configuration
Explanation: N (2p³) has a stable half-filled configuration, which resists removal of electrons more than O (2p⁴).
Q2. Which of the following increases down a group?
(a) Electronegativity
(b) Ionisation enthalpy
(c) Atomic radius
(d) Electron affinity
Answer: (c) Atomic radius
Explanation: More shells are added → atomic radius increases.
Q3. What is the general trend of metallic character across a period?
(a) Increases
(b) Decreases
(c) Constant
(d) First increases then decreases
Answer: (b) Decreases
Explanation: Across a period, ionisation enthalpy increases, and the tendency to lose electrons (metallic character) decreases.
We hope the given case study questions for Classification of Elements and Periodicity in Properties Class 11 helps you in your learning.
Also check
- Chemical Thermodynamics Class 11 Case Study Questions Chemistry Chapter 5
- Chemical Bonding and Molecular Structure Class 11 Case Study Questions Chemistry Chapter 4
- Classification of Elements and Periodicity in Properties Class 11 Case Study Questions Chemistry Chapter 3
- Structure of Atom Class 11 Case Study Questions Chemistry Chapter 2
- Some Basic Concepts of Chemistry Class 11 Case Study Questions Chemistry Chapter 1
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Topics from which case study questions may be asked
- Modern periodic law
- Trends in periodic properties
- Atomic and ionic radii
- Ionization enthalpy
Periodic classification helps in predicting the properties of elements based on their position in the table.
For further practice on case study questions related to Classification of Elements and Periodicity in Properties Class 11 Chemistry, we recommend exploring the link given below.
Frequently Asked Questions (FAQs) on Classification of Elements and Periodicity in Properties Case Study Questions
Q1: What are case study questions in Classification of Elements and Periodicity in Properties?
A1: These are application-based questions that assess understanding of Classification of Elements and Periodicity in Properties concepts.
Q2: Are case study questions part of CBSE Class 11 Chemistry?
A2: Yes, CBSE includes case study/competency-based questions in exams.
Q3: How can I prepare for Chemistry case study questions?
A3: Focus on conceptual clarity, real-life applications, and NCERT-based understanding.
Q4: Are answers provided for Classification of Elements and Periodicity in Properties case study questions?
A4: Yes, detailed answers are provided for all case study questions.
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