Hydrogen and s - block Elements
Kerala Board · Class 12 · Chemistry
Complete topic list for Hydrogen and s - block Elements in Kerala Board Class 12 Chemistry. Key concepts, sub-topics, and what to focus on for board exams.
Topics in Hydrogen and s - block Elements
Hydrogen - Structure, Position and Isotopes
- Hydrogen has electronic configuration 1s¹ - simplest atom with one proton and one electron
- Unique position in periodic table - can be placed with alkali metals (ns¹) or halogens (gains electron to form H⁻)
- Three isotopes: Protium (¹H), Deuterium (²H or D), Tritium (³H or T)
Chemical Properties and Uses of Hydrogen
- Hydrogen is diatomic gas (H₂), colorless, odorless, lightest gas
- Insoluble in water but adsorbed by Pt and Pd metals
- Combustible - burns with pale blue flame in air
Water and Heavy Water
- Water (H₂O) has bent structure with bond angle 104.5°, O-H bond length 97.5 pm
- Highly polar due to electronegativity difference - forms hydrogen bonds
- Ice has open tetrahedral structure making it less dense than liquid water
Hydrogen Peroxide (H₂O₂)
- H₂O₂ has oxidation state of oxygen = -1 (between 0 in O₂ and -2 in H₂O)
- Acts as both oxidizing and reducing agent due to intermediate oxidation state
- Colorless, syrupy liquid with sharp odor, bp = 423K
Key Concepts
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What are the important topics in Hydrogen and s - block Elements for Kerala Board Class 12 Chemistry?
Hydrogen and s - block Elements covers several key topics that are frequently asked in Kerala 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 Hydrogen and s - block Elements — Kerala Board Class 12 Chemistry?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.
Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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