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Study of the First Element - Hydrogen

ICSE · Class 9 · Chemistry

Quick revision notes for Study of the First Element - Hydrogen — ICSE Class 9 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

44 questions24 flashcards5 concepts

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An infographic illustrating hydrogen's similarities to both Group 1 (alkali metals) and Group 17 (halogens) elements, explaining why its position is unique and debated.
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Key Topics to Revise

1

Position of Hydrogen in Periodic Table

  • Hydrogen is placed in Group 1A and Period 1 of the periodic table
  • Electronic configuration: 1 (only 1 electron in K shell)
  • Atomic number: 1, Atomic mass: 1, Valency: 1
2

Occurrence and Discovery

  • Free state: Found in traces in earth's crust (0.98%), atmosphere (0.01%), volcanic gases (0.025%)
  • Combined state: Present in water (11.1% by weight), acids, alkalis, hydrocarbons, proteins, carbohydrates
  • Most abundant element in sun and stars (1.1%)
3

Preparation of Hydrogen from Water

  • Cold water reactions: K, Na, Ca react vigorously with cold water
  • Hot water: Mg reacts slowly with boiling water
  • Steam reactions: Al, Zn, Fe react with steam at high temperatures
4

Preparation from Acids and Alkalis

  • Metals above hydrogen in activity series displace hydrogen from dilute acids
  • Preferred metals: Mg, Al, Zn, Fe react with dilute HCl or H₂SO₄
  • Zinc is most preferred for laboratory preparation

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Full Notes

Key Concepts

Hydrogen occupies a unique positionThe activity series arranges metalsHydrogen is prepared by reacting granulatedLargeHydrogen acts as a reducing agent

Frequently Asked Questions

What are the important topics in Study of the First Element - Hydrogen for ICSE Class 9 Chemistry?
Study of the First Element - Hydrogen covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Study of the First Element - Hydrogen — ICSE Class 9 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

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

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