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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 product written with a downward arrow in a chemical equation will have which property?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Easy 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 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 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 ScienceWhy are antioxidants useful in foods containing oils and fats?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium 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 ScienceWhich of the following reactions involves both oxidation and reduction occurring simultaneously?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceIn which situation will a substance be reduced?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Easy ScienceOne substance loses oxygen and another substance gains that oxygen. What is the most accurate term for this reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhy is the conversion of copper oxide into copper called reduction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Easy ScienceIn the reaction CuO + H₂ → Cu + H₂O, the formation of water proves the oxidation of which substance?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhen aqueous solutions of two ionic compounds are mixed, an insoluble solid forms. This is an example of which type of reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhat visible change occurs when an aqueous solution of sodium sulphate is mixed with an aqueous solution of barium chloride?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhen an iron nail is placed in a blue copper sulphate solution, the blue colour gradually fades because the concentration of which ion decreases?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceIn the electrolysis of water, the volumes of gases collected at the cathode and anode are in the ratio 2:1. If the gas with the lower volume is oxygen, which gas has the higher volume?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhy is the use of silver bromide in photography possible?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium