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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 questions40 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, nature, and discovery of hydrogen

  • Hydrogen is the first element of the periodic table.
  • Its atomic number is 1 and electronic configuration is 1 in the K shell.
  • It is placed in the 1st Period and Group 1A.
2

Hydrogen from water, acids, and alkalis

  • Hydrogen can be prepared from water, dilute acids, and alkalis.
  • Cold water reacts with potassium, sodium, and calcium.
  • Potassium floats on water, melts at 62°C, and burns with a lilac flame.
3

Laboratory preparation, purification, and collection of hydrogen

  • Granulated zinc and dilute hydrochloric acid or dilute sulphuric acid are used in the laboratory preparation of hydrogen.
  • Zinc granules are preferred over pure zinc because copper impurity acts as a catalyst.
  • The gas is collected by downward displacement of water.
4

Industrial preparation, properties, and uses of hydrogen

  • Hydrogen is manufactured by the Bosch process and by electrolysis of acidulated water.
  • In the Bosch process, steam is passed over hot coke at 1000°C to form water gas.
  • Water gas is a mixture of carbon monoxide and hydrogen.

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Full Notes

Key Concepts

Hydrogen has atomic number 1Hydrogen resembles alkali metals because itHenry Cavendish prepared hydrogen from ironHydrogen is found in tracesVery reactive metals like potassium

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?
Understand the core concepts first, then work through the 44 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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