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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 a closed container, the total mass of the reactants is 50 g. Until the reaction is complete, no matter leaves the container and no matter enters it. What will be the total mass of the products?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceIf, during a change, the colour changes, a gas is formed, and heat is released, what is the most appropriate conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhen two aqueous solutions are mixed and a white solid insoluble in water is formed, which type of reaction does this indicate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceIn a closed container, the total mass remains the same before and after a chemical reaction. Which law does this illustrate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhat is the most reliable indication that a chemical reaction has occurred?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceA student dipped an iron nail in a blue copper sulphate solution for some time. A reddish-brown coating formed on the nail and the solution turned green. Which type of reaction does this change illustrate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceA student writes the reaction of steam with red-hot iron as \(Fe + H_2O \to FeO + H_2\). Which option correctly corrects the error?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhich of the following is a decomposition reaction but not a photolytic decomposition reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhen an iron nail is placed in a blue copper sulphate solution, the solution changes colour and copper gets deposited. What type of reaction is this?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhen is the aqueous symbol used?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhat is the correct meaning of a downward arrow in a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhat is the correct meaning of an upward arrow in a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceIf bubbles form during an experiment, what is the most careful conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceIf the container becomes hot during a reaction, which conclusion is most suitable?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceIf a reaction container feels cold to the touch during a chemical reaction, what is the most appropriate conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhat is done to balance a skeletal chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhy is respiration called an exothermic reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhy is the conversion of milk into curd considered a chemical change?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhy does keeping food in an airtight container reduce rancidity?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceHow do antioxidants help preserve food materials?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium