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Chemical Substances Nature And Behaviour

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

ScienceWhat will be the ratio of magnesium atoms to oxygen atoms in five formula units of magnesium oxide?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceIf the reactants and products are correct but the atoms of one element are unequal, what is the conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhy is changing subscripts considered a serious error while balancing a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhich statement best explains the scientific need for a balanced chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhy can a lower measured mass after gas escapes from an open container give a wrong conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceIn a closed container, gas and a precipitate both form during a reaction, but nothing escapes. What is the correct conclusion about mass?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceHow is the reaction Zn + CuSO₄ → ZnSO₄ + Cu most accurately classified?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Hard ScienceIn galvanisation, the zinc layer protects iron from contact with which substances?Class 10Chemical Substances – Nature and BehaviourMetals and Non-metalsLevel 4Medium ScienceWhy are oxidation and reduction understood together in a redox reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceWhen copper oxide is heated with hydrogen, the black substance becomes reddish brown. What does this prove?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceWhy is a precipitate shown by a downward arrow in a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 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