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Chemical Reactions

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

ScienceWhich of the following observations is not evidence that a chemical reaction has occurred?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Easy ScienceAccording to the law of conservation of mass, how should the number of atoms of each element compare on the reactant and product sides of a balanced chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceOn what basis can respiration be related to combustion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhy is a combustion reaction generally considered exothermic?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhen two or more reactants combine to form a single product, which type of reaction is it?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Easy ScienceIf a chemical reaction produces two or more products from a single reactant, what type of reaction is it?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Easy ScienceWhich observation is the most suitable indicator of a precipitation reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhat is the correct difference between melting of ice and burning of a candle?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhich of the following changes is the best example of a chemical change?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhy are antioxidants added to food materials to prevent rancidity?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhat is the scientific reason for filling potato chips packets with nitrogen gas?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceA white sample of silver chloride turns grey when kept in sunlight. Which equation correctly represents this change?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhat role do air and moisture play in the rusting of iron?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhat is a reaction called in which one substance gains oxygen and another substance loses oxygen?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceIn the reaction CuO + H₂ → Cu + H₂O, which process occurs to hydrogen?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhen copper oxide is heated with hydrogen, copper is formed. Which process occurs to copper oxide in this reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhen an aqueous solution of barium chloride is mixed with an aqueous solution of sodium sulphate, a white precipitate is formed. What type of reaction is this?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhen a zinc strip is placed in copper sulphate solution, which statement is correct?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhy does the blue colour of copper sulphate solution fade and turn green when an iron nail is added?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhat is the ratio of the volumes of hydrogen and oxygen gases collected during the electrolysis of water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium