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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।

ScienceIn which of the following reactions does one part of the same reactant undergo oxidation while another part undergoes reduction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhich of the following reaction is both a combination reaction and an oxidation-reduction reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhich change is the clearest indication that a chemical reaction has occurred?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhich statement correctly describes the difference between a skeletal chemical equation and a balanced chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceIn an unknown chemical reaction, a gas was evolved and the container became cold. Which conclusion is the most cautious?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhy should a final conclusion about a chemical reaction not be drawn from colour change alone?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhen an iron nail is kept in a blue copper sulphate solution for some time, the solution turns light green and a reddish-brown coating forms on the nail. Which is the correct explanation for this observation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhy is digestion of food a chemical change, whereas chewing food is mainly a physical change?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhat does writing sunlight above the arrow in the following photosynthesis equation indicate? \(6CO_2 + 6H_2O \xrightarrow{\text{sunlight}} C_6H_{12}O_6 + 6O_2\)Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhich fact should be considered while identifying a similarity between respiration and combustion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhat type of reaction is represented by the following general equation? \[ A+B\rightarrow C+\text{heat} \]Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceIf, in a reaction, a single compound absorbs heat and forms two or more products, what is the most appropriate classification of the reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceIf the reaction mixture is not heated externally, which observation strongly suggests an exothermic reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceDuring a chemical reaction, which observation indicates that it is endothermic?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceIf a food packet contains more oxygen and is stored at a higher temperature, which problem becomes more likely?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceHow does filling nitrogen in chips packets affect the role of oxygen?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhich process can become faster when edible oil is kept in an open bottle and exposed to oxygen in air?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhat is the similarity between galvanisation and painting?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhat role does moisture play in the rusting of iron?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceIn which situation is a substance oxidised?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard