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Revision Notes

Carbon : An important element

Maharashtra Board · Class 9 · Science

Quick revision notes for Carbon : An important element — Maharashtra Board Class 9 Science. Key concepts, formulas, and definitions for last-minute revision.

43 questions22 flashcards5 concepts

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Key Topics to Revise

1

Basic Properties and Occurrence of Carbon

  • Carbon is a non-metallic element with symbol C, atomic number 6, atomic mass 12
  • Electronic configuration: 2,4 with valency 4
  • Forms 4 covalent bonds by sharing electrons
2

Allotropes of Carbon

  • Carbon has crystalline forms (diamond, graphite, fullerene) and amorphous forms (coal, charcoal, coke)
  • Diamond: Hardest natural substance, 3D tetrahedral structure, electrical insulator, density 3.5 g/cm³
  • Graphite: Soft, layered hexagonal structure, electrical conductor, density 1.9-2.3 g/cm³
3

Hydrocarbons

  • Hydrocarbons contain only carbon and hydrogen atoms
  • Saturated hydrocarbons have only single bonds (alkanes)
  • Unsaturated hydrocarbons have double or triple bonds (alkenes, alkynes)
4

Carbon Dioxide (CO₂)

  • Molecular formula: CO₂, Molecular mass: 44, Melting point: -56.6°C
  • Present in air as 0.03%, in exhaled air as 4%
  • Colorless, odorless gas, denser than air

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Full Notes

Key Concepts

Carbon has atomic number 6Carbon exists in different physical formsCompounds containing only carbon and hydrogenMolecular mass 44Molecular mass 16

Frequently Asked Questions

What are the important topics in Carbon : An important element for Maharashtra Board Class 9 Science?
Carbon : An important element covers several key topics that are frequently asked in Maharashtra Board 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 Carbon : An important element — Maharashtra Board Class 9 Science?
Understand the core concepts first, then work through the 43 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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