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Chemical Reactions And Equations

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

ScienceWhich is the correct pair of solid residue and gas in decomposition of calcium carbonate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5MediumScienceWhen calcium carbonate is heated a solid and a gas are formed. What type of reaction is this?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5MediumScienceWhat are the product and energy change when water is added to calcium oxide?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5MediumScienceHow is burning of magnesium both combination and oxidation at the same time?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5MediumScienceCleaning magnesium ribbon before burning removes which obstacle?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5MediumScienceWhat 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 5MediumScienceIf 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 5MediumScienceWhy is changing subscripts considered a serious error while balancing a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5HardScienceWhich statement best explains the scientific need for a balanced chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5MediumScienceWhy 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 5HardScienceIn 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 5MediumScienceHow is the reaction Zn + CuSO₄ → ZnSO₄ + Cu most accurately classified?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceWhy are oxidation and reduction understood together in a redox reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceA student claims that in the reaction 2Mg + O₂ → 2MgO, magnesium is reduced because it combines with oxygen. What is the correct evaluation of this claim?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceWhen 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 4MediumScienceWhy is a precipitate shown by a downward arrow in a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceA 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 4HardScienceWhy does a green solution form when an iron nail is placed in copper sulphate solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceOn what basis is the main difference between electrolytic decomposition and photolytic decomposition identified?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceWhat 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