Ethane, with the molecular formula C2H6 has (a) 6 covalent bonds (b) 7 covalent bonds (c) 8 covalent bonds (d) 9 covalent bonds The correct answer is (a) 7 covalent bonds. Ethane has 2 carbon atoms, each sharing 3 pairs of electrons with 3 hydrogen atoms. This forms 6 C-H bonds. The 2 carbon atoms […]
Q. You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels. NCERT Class 10 Science | Chapter: Acids, Bases and Salts / Carbon and Its Compounds | Texcellency Book Series ✅ Answer in Brief (For Quick Revision) Lemon juice contains
What type of oxides are formed when non-metals combine with oxygen? NCERT Class 10 Science | Chapter: Metals and Non-Metals | Texcellency Book Series ✅ Answer in Brief (For Quick Revision) When non-metals combine with oxygen, they form acidic oxides — oxides that dissolve in water to produce acids, turning the solution acidic (pH less
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Q. Which metals do not corrode easily? NCERT Class 10 Science | Chapter: Metals and Non-Metals | Texcellency Book Series ✅ Answer in Brief (For Quick Revision) Metals that do not corrode easily fall into two categories: 🔵 Category 1 — Metals low on the reactivity series (naturally unreactive): Gold (Au), Platinum (Pt), Silver (Ag),
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Q. Metallic oxides of zinc, magnesium and copper were heated with the Zinc, Magnesium, and Copper separately. In which cases will you find displacement reactions taking place? NCERT Class 10 Science | Chapter: Metals and Non-Metals | Texcellency Book Series ✅ Answer in Brief (For Quick Revision) The reactivity order is: Mg > Zn
Q. Which of the following methods is suitable for preventing an iron frying pan from rusting? (a) Applying grease (b) Applying paint (c) Applying a coating of zinc (d) All of the above. The best method for preventing rust on an iron frying pan is applying a coating of zinc. This method provides a durable
Q. Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it, as shown in figure below. (a) What will be the action of gas on (i) dry litmus paper? (ii) moist litmus paper? (b) Write a balanced chemical equation for the reaction taking
Q. What type of oxides are formed when non-metals combine with oxygen? When non-metals like carbon, sulfur, and nitrogen combine with oxygen, they form what we call acidic oxides. These are special kinds of compounds because when they dissolve in water, they make the water slightly acidic. It’s like when you mix lemon juice in
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Q. You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels. When copper vessels get tarnished, it means they have become dull and lost their shine because of a layer of something called copper oxide. This happens when copper reacts
Q. A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady