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Class 10 Science

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

ScienceDuring electrolysis of acidified water, 15 mL of oxygen is collected at the anode. A student says that 15 mL of hydrogen will also be produced at the cathode because water contains both H and O. What is the correct correction to the student's statement?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard ScienceWhich of the following reactions is not an oxidation-reduction (redox) reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard ScienceWhen an iron nail is placed in a blue copper sulphate solution, a reddish-brown copper coating forms on the nail and the solution turns pale green. What causes both changes?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard ScienceWhich of the following equations represents an exothermic combination reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard 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 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 ScienceWhen an iron nail is dipped in a copper sulfate solution, which observation confirms a displacement reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhen lead nitrate is heated, a brown gas and oxygen are formed. What is the solid residue?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhich of the following chemical equation represents a double displacement reaction in which a precipitate is formed?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceWhich of the following reactions shows a more reactive metal displacing a less reactive metal from its aqueous salt solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceWhat type of reaction is \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\), and why?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceWhich substance is reduced in the reaction between copper(II) oxide and hydrogen?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceWhich of the following equations represents a decomposition reaction that occurs in the presence of light?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard 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 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 ScienceWhy is respiration called an exothermic reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhy does painting iron reduce rusting?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhich two processes occur simultaneously in a redox reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium