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Modern Periodic Law and Trends Class 11 Chemistry MCQs with Answers
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Free Online Practice Test: Modern Periodic Law and Trends Class 11
Introduction Paragraph
The CBSE Class 11 Chemistry MCQs on “Modern Periodic Law and Trends” are designed to help students master one of the most fundamental topics in Physical Chemistry. This topic, part of Chapter 3: Classification of Elements and Periodicity in Properties, focuses on how the periodic table reflects recurring patterns in the physical and chemical properties of elements. Understanding these periodic trends—such as atomic radius, ionization energy, electronegativity, and electron affinity—is essential for performing well in board exams as well as competitive tests like JEE and NEET.
Our online practice test follows the latest NCERT syllabus, ensuring conceptual accuracy and exam relevance. Each question is crafted to strengthen problem-solving skills and reinforce theoretical understanding through instant feedback and detailed explanations. By practicing these MCQs, Class 11 students can build a solid foundation in periodic classification and confidently prepare for CBSE board examinations.
Sample MCQs (with Answers and Explanations)
Q1. Who proposed the Modern Periodic Law?
A) Mendeleev B) Dalton C) Moseley D) Thomson
Answer: C) Moseley
Explanation: Henry Moseley proposed the Modern Periodic Law, stating that properties of elements are periodic functions of their atomic numbers.
Q2. Across a period, atomic radius generally:
A) Increases B) Decreases C) Remains same D) First increases, then decreases
Answer: B) Decreases
Explanation: With an increase in nuclear charge, the electrons are pulled closer to the nucleus, reducing atomic size.
Q3. Which element has the highest electronegativity?
A) Oxygen B) Nitrogen C) Fluorine D) Chlorine
Answer: C) Fluorine
Explanation: Fluorine is the most electronegative element (3.98 on Pauling scale) due to its small size and high effective nuclear charge.
Q4. Ionization energy across a period generally:
A) Decreases B) Increases C) Remains constant D) Irregularly changes
Answer: B) Increases
Explanation: Increased nuclear attraction makes it harder to remove electrons, leading to higher ionization energies.
Q5. Which of the following shows a periodic property?
A) Atomic radius B) Atomic mass C) Density D) Melting point
Answer: A) Atomic radius
Explanation: Atomic radius exhibits periodic variation with atomic number, decreasing across a period and increasing down a group.