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Hydrogen — Revision Notes

ICSE · Class 8 · Chemistry

Hydrogen revision notes for ICSE Class 8 Chemistry: 4 topics in quick points. Part of the ICSE Class 8 Chemistry syllabus.

110 questions38 flashcards5 formulas & key relations5 concepts

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Key Topics to Revise

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.

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Full Notes

Key Concepts

Hydrogen is a colourlessHydrogen gas was first prepared byWhen acidulated water is electrolysedHydrogen is prepared in the labVery active metals like sodium

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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