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Class10

Class 10 Science के इस tag से जुड़े questions। हर question के साथ chapter, topic, level और difficulty दी गई है।

ScienceA student says that carbon dioxide extinguishes fire, so pouring CO₂ over a burning magnesium ribbon will put it out. Why is this statement incorrect?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Hard ScienceMetal A displaces metal B, and metal B displaces metal C. Which metal is the least reactive?Class 10Metals and Non-metalsReactivity seriesLevel 4Medium ScienceCopper deposits on an iron nail placed in copper sulphate solution. This observation is based on which principle?Class 10Chemical Substances – Nature and BehaviourMetals and Non-metalsLevel 4Medium ScienceWhy does a green solution form when an iron nail is placed in copper sulphate solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceOn what basis is the main difference between electrolytic decomposition and photolytic decomposition identified?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceWhat mainly increases when a small amount of acid is added during the electrolysis of water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceIn which of the following reactions does an element in the same substance undergo both oxidation and reduction simultaneously?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Hard ScienceIn the electrolysis of water, if the volume of oxygen produced is 15 mL, what will be the volume of hydrogen produced under the same conditions?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceWhat is the most correct reason for keeping silver salts in dark-coloured bottles?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceWhich gas is identified by brown fumes in the decomposition of lead nitrate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceOn what basis is the reaction of calcium oxide and water called an exothermic combination reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceWhy is burning of magnesium both a combination reaction and an oxidation reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceWhy is a magnesium ribbon cleaned by rubbing it with sandpaper before burning?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Expert ScienceWhat will be the ratio of magnesium atoms to oxygen atoms in four formula units of magnesium oxide?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceIf iron atoms are equal but oxygen atoms are not equal in an equation, what is the equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceWhat is the deepest reason for keeping atoms of all elements equal on both sides of a balanced chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Hard ScienceAfter a reaction in an open container, the measured mass appears lower because a gas produced has escaped. What is the correct scientific explanation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Hard ScienceIn a closed container, a chemical reaction produces a gas and the temperature rises, but no matter escapes. What is the correct conclusion about the total mass of the container and its contents before and after the reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Expert ScienceWhich chemical process do antioxidants slow down in food?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceWhy does an oiled iron object rust less?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium