Chapter 14 of 18
Revision Notes
Substances in Common Use — Revision Notes
Maharashtra Board · Class 9 · Science
Substances in Common Use revision notes for Maharashtra Board Class 9 Science: 4 topics in quick points. Includes Important Salts in Daily Life, Sodium.
45 questions24 flashcards3 formulas & key relations5 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 NotesKey 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?
Key topics in Substances in Common Use include Important Salts in Daily Life, Sodium Chloride (Common Salt - NaCl), Sodium Bicarbonate (Baking Soda - NaHCO₃), Bleaching Powder (CaOCl₂). Study these first, then practise questions on each for Class 9 exams.
How should I revise Substances in Common Use for Class 9 exams?
Learn the core ideas first, then work through the 45 practice questions on Substances in Common Use. Revise 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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