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Revision Notes

Substances in Common Use

Maharashtra Board · Class 9 · Science

Quick revision notes for Substances in Common Use — Maharashtra Board Class 9 Science. Key concepts, formulas, and definitions for last-minute revision.

45 questions24 flashcards5 concepts

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Key Topics to Revise

1

Important Salts in Daily Life

  • Salts are ionic compounds without H⁺ and OH⁻ ions containing one type of cation and anion
  • Sea water contains about 80 million tons of salts annually
  • Important sea salts: NaCl, MgCl₂, MgSO₄, KCl, CaCO₃, MgBr₂
2

Sodium Chloride (Common Salt - NaCl)

  • Most commonly used salt, gives salty taste to food
  • Formed by neutralization: NaOH + HCl → NaCl + H₂O
  • Neutral salt with pH = 7
3

Sodium Bicarbonate (Baking Soda - NaHCO₃)

  • Chemical name: Sodium hydrogen carbonate
  • White, non-crystalline powder
  • Basic in nature (turns red litmus blue)
4

Bleaching Powder (CaOCl₂)

  • Chemical name: Calcium oxychloride
  • Yellowish-white solid with strong chlorine odor
  • Prepared by: Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O

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Full Notes

Key Concepts

Everyday substances can be scientifically classifiedCommon salt or table saltA whiteCrystalline sodium carbonate that converts hardA yellowish

Frequently Asked Questions

What are the important topics in Substances in Common Use for Maharashtra Board Class 9 Science?
Substances in Common Use 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 Substances in Common Use — Maharashtra Board Class 9 Science?
Understand the core concepts first, then work through the 45 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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