(I) Combustion: C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O (II) Dehydration: C₂H₅OH →[conc. H₂SO₄, 443 K] C₂H₄ + H₂O (III) Oxidation: C₂H₅OH + [O] → CH₃CHO + H₂O (using acidified K₂Cr₂O₇) CBSE Sample Paper Class 10 Science 2025-26 Tiwari Academy provides CBSE Class 10 ...
Category: Class 10 Science
NCERT Solutions for Class 10 Science and important questions for CBSE class 10 for session 2020-2021
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X: Alcohol (ethanol, C₂H₅OH) – a good solventY: Hydrogen gas (H₂)Z: Sodium ethoxide (C₂H₅ONa) – used in making vegetable ghee Reaction: 2C₂H₅OH + 2Na → 2C₂H₅ONa + H₂↑ 10 years solved cbse sample paper for class 10 science 2026 board exam ...
Two observations that indicate a chemical change are: (1) Formation of a new substance, such as a gas, precipitate, or color change. (2) Release or absorption of energy, like heat, light, or sound, during the reaction. 2025-26 sample paper question available ...
Both A and B are true but R is not the correct explanation of A. Baking soda is used in Soda acid fire extinguishers because it release is carbon dioxide gas upon reaction with H2SO4. CO2 helps put out fire ...
The correct option is [C]. Sodium carbonate decahydrate (Na₂CO₃·10H₂O), also called washing soda, is used to remove permanent hardness of water. It reacts with calcium and magnesium salts, forming insoluble carbonates, softening the water effectively. Download cbse sample paper for class ...