Substances in Common Use — Flashcards
Maharashtra Board · Class 9 · Science
24 flashcards for Substances in Common Use (Maharashtra Board Class 9 Science) to test yourself on key terms and facts.
Interactive on Super Tutor
Studying Substances in Common Use? Get the full interactive chapter.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for flashcards and more.
Free trial, no card needed.
What are simple salts? Give two examples.
Answer
Simple salts are ionic compounds that do not contain H⁺ and OH⁻ ions and contain only one kind of cation and anion. Examples: Na₂SO₄ (sodium sulphate), CaCl₂ (calcium chloride).
Name the six important salts found in seawater.
Answer
1. Sodium chloride (NaCl) 2. Magnesium chloride (MgCl₂) 3. Magnesium sulphate (MgSO₄) 4. Potassium chloride (KCl) 5. Calcium carbonate (CaCO₃) 6. Magnesium bromide (MgBr₂)…
What is the chemical name and formula of table salt? Write the neutralization reaction that forms it.
Answer
Chemical name: Sodium chloride, Formula: NaCl. Neutralization reaction: NaOH + HCl → NaCl + H₂O. It is a neutral salt with pH = 7.
What happens when saturated brine (NaCl solution) is electrolyzed?
Answer
When electric current passes through saturated brine: At cathode: Hydrogen gas is released. At anode: Chlorine gas is released. Reaction: 2NaCl + 2H₂O → 2NaOH + Cl₂ ↑ + H₂ ↑. Important basic compound …
What is the chemical name and formula of baking soda? Why is it used in cooking?
Answer
Chemical name: Sodium hydrogen carbonate or sodium bicarbonate. Formula: NaHCO₃. It is used in cooking because it makes cake porous and bhaji crisp. It is basic in nature and releases CO₂ when heated.
List four important uses of baking soda (NaHCO₃).
Answer
1. Making bread, cake, and dhokla 2. Reducing acidity in the stomach (antacid) 3. Making CO₂ in fire extinguishers 4. Cleaning ovens…
What is the chemical name and formula of bleaching powder? How is it prepared?
Answer
Chemical name: Calcium oxychloride, Formula: CaOCl₂. Preparation: Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O (chlorine gas reacts with slaked lime)…
Why does bleaching powder have a strong odour of chlorine? Write the reaction.
Answer
Bleaching powder slowly decomposes due to CO₂ in air and releases chlorine gas. Reaction: CaOCl₂ + CO₂ → CaCO₃ + Cl₂ ↑. This released chlorine gas gives it the characteristic odour and bleaching prope…
+16 more flashcards
Practise AllFrequently Asked Questions
What are the important topics in Substances in Common Use for Maharashtra Board Class 9 Science?
How many flashcards are available for Substances in Common Use?
How should I revise Substances in Common Use for Class 9 exams?
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Substances in Common Use
For serious students
Get the full Substances in Common Use chapter — start free.
Quizzes, flashcards, an AI doubt solver and a study plan for Maharashtra Board Class 9 Science. Free to start, no card needed.