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Chapter Summary

Hydrogen

ICSE · Class 8 · Chemistry

Summary of Hydrogen for ICSE Class 8 Chemistry. Key concepts, important points, and chapter overview.

110 questions38 flashcards5 concepts

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Overview

Hydrogen is the lightest of all elements and an important part of water, acids, alkalis, organic compounds, and many other substances. It is a diatomic gas with symbol H, formula H2, atomic number 1, atomic mass 1.00794 amu, and valency 1. Hydrogen is found mainly in combined state on Earth, but it

Key Concepts

Hydrogen is a colourless

Hydrogen is a colourless, odourless, tasteless, and non-poisonous gas. It exists mainly in combined state on Earth, especially in water and organic co

Hydrogen gas was first prepared by

Hydrogen gas was first prepared by Robert Boyle in 1672. Henry Cavendish studied it in 1776 and called it inflammable gas because it burns easily. Lav

When acidulated water is electrolysed

When acidulated water is electrolysed, it breaks into hydrogen and oxygen in a 2:1 ratio by volume. Hydrogen is collected at the cathode and oxygen at

Hydrogen is prepared in the lab

Hydrogen is prepared in the lab by reacting granulated zinc with dilute hydrochloric acid or dilute sulphuric acid. The balanced equations are Zn + 2H

Very active metals like sodium

Very active metals like sodium, potassium, and calcium release hydrogen from cold water. Magnesium reacts slowly with hot water. Magnesium, zinc, alum

Learning Objectives

  • Describe the physical and chemical properties of hydrogen
  • Explain preparation of hydrogen by electrolysis of water
  • Explain laboratory preparation of hydrogen using zinc and dilute acid
  • Describe the Bosch process for large-scale manufacture of hydrogen
  • Recall the reactions, tests, and uses of hydrogen

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.

More resources for Hydrogen

All 9 chapters — ICSE Class 8 Chemistry Chapter Summary

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