Substances in Common Use
Maharashtra Board · Class 9 · Science
Flashcards for Substances in Common Use — Maharashtra Board Class 9 Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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
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