Chapter 14 of 18
Syllabus
Substances in Common Use — Syllabus
Maharashtra Board · Class 9 · Science
What Substances in Common Use covers in Maharashtra Board Class 9 Science: 4 topics, for the 2026-27 session. Topics include Important Salts in Daily.
45 questions24 flashcards3 formulas & key relations5 concepts
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4 Topics · Maharashtra Board Class 9 Science · 2026-27
Topics in Substances in Common Use
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
Key Concepts
Everyday substances can be scientifically classifiedCommon salt or table saltA whiteCrystalline sodium carbonate that converts hardA yellowish
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Start This ChapterFrequently 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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