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Chapter Summary

Elements of Groups 16, 17 and 18

Maharashtra Board · Class 12 · Chemistry

Summary of Elements of Groups 16, 17 and 18 for Maharashtra Board Class 12 Chemistry. Key concepts, important points, and chapter overview.

45 questions25 flashcards5 concepts

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Overview

This chapter explores the fascinating chemistry of p-block elements from groups 16, 17, and 18. Group 16 (oxygen family/chalcogens) includes oxygen, sulfur, selenium, tellurium, and polonium. Group 17 (halogens) comprises fluorine, chlorine, bromine, iodine, and astatine. Group 18 (noble gases) cont

Key Concepts

Group 16 has ns²np⁴ configuration

Group 16 has ns²np⁴ configuration, Group 17 has ns²np⁵, and Group 18 has ns²np⁶. Atomic radii increase down the group, while ionization enthalpy and e

Oxygen is diatomic (O₂) and paramagnetic

Oxygen is diatomic (O₂) and paramagnetic, shows limited oxidation states (-2, -1, +2), and H₂O is liquid due to hydrogen bonding. Fluorine shows only

Industrial preparation involves

Industrial preparation involves: S + O₂ → SO₂, then 2SO₂ + O₂ ⇌ 2SO₃ (with V₂O₅ catalyst at 720K), finally SO₃ + H₂SO₄ → H₂S₂O₇, then H₂S₂O₇ + H₂O → 2

Prepared by silent electric discharge through

Prepared by silent electric discharge through oxygen: 3O₂ ⇌ 2O₃. Ozone is a powerful oxidizing agent (O₃ → O₂ + [O]), acts as bleaching agent without

Halogens (X₂) show decreasing reactivity down

Halogens (X₂) show decreasing reactivity down the group (F₂ > Cl₂ > Br₂ > I₂). They form HX compounds with acidic strength order: HI > HBr > HCl > HF.

Learning Objectives

  • Understand the electronic configuration and periodic trends of groups 16, 17, and 18 elements
  • Explain the anomalous behavior of first elements (oxygen and fluorine) in their respective groups
  • Study the preparation, properties, and uses of important compounds like H2SO4, HCl, and ozone
  • Learn about allotropy in sulfur and oxygen
  • Understand interhalogen compounds and their structures

Frequently Asked Questions

What are the important topics in Elements of Groups 16, 17 and 18 for Maharashtra Board Class 12 Chemistry?
Elements of Groups 16, 17 and 18 covers several key topics that are frequently asked in Maharashtra Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Elements of Groups 16, 17 and 18 — Maharashtra Board Class 12 Chemistry?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Elements of Groups 16, 17 and 18

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