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Hydrogen

ICSE · Class 8 · Chemistry

Quick revision notes for Hydrogen — ICSE Class 8 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

110 questions38 flashcards5 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?
Hydrogen covers several key topics that are frequently asked in ICSE Class 8 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 — ICSE Class 8 Chemistry?
Understand the core concepts first, then work through the 110 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.

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