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Hydrogen — Syllabus

ICSE · Class 8 · Chemistry

What Hydrogen covers in ICSE Class 8 Chemistry: 4 topics, for the 2026-27 session. Part of the ICSE Class 8 Chemistry syllabus.

110 questions38 flashcards5 formulas & key relations5 concepts

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4 Topics · ICSE Class 8 Chemistry · 2026-27

Topics in Hydrogen

1

Basic Facts and Discovery

  • Symbol of hydrogen is H.
  • Formula of hydrogen gas is H2.
  • Valency of hydrogen is 1.
2

Occurrence of Hydrogen

  • Hydrogen is the most abundant element in the universe.
  • It is found in very small amounts in the outer atmosphere of Earth and in volcanic gases.
  • On Earth, hydrogen is mostly found in combined state.
3

Preparation of Hydrogen

  • Hydrogen can be prepared by electrolysis of acidulated water.
  • Hydrogen can also be prepared by the action of dilute acids on active metals.
  • Hydrogen is prepared in the laboratory by using granulated zinc and dilute hydrochloric acid or dilute sulphuric acid.
4

Preparation from Water and Steam

  • Very active metals like sodium, potassium, and calcium react with cold water to form hydroxides and hydrogen.
  • Sodium and potassium react violently with water.
  • Calcium reacts comparatively slowly.

Key Concepts

Central concept: Hydrogen

Identity and basic propertiesHistory of discovery and namingOccurrencePreparation in the laboratoryManufacture on large scalePhysical propertiesChemical propertiesReactions with metals and water

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Frequently Asked Questions

What are the important topics in Hydrogen for ICSE Class 8 Chemistry?
Key topics in Hydrogen include Basic Facts and Discovery, Occurrence of Hydrogen, Preparation of Hydrogen, Preparation from Water and Steam. Study these first, then practise questions on each for Class 8 exams.
How should I revise Hydrogen for Class 8 exams?
Learn the core ideas first, then work through the 110 practice questions on Hydrogen. Revise 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.

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All ICSE Class 8 Chemistry Syllabus

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