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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।

ScienceWhat happens to hydrogen in the reaction between copper oxide and hydrogen?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhen an iron nail is placed in copper sulphate solution, the solution changes colour and copper is deposited. What type of chemical reaction is this?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhy does no reaction occur when a copper strip is placed in zinc sulphate solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhat is the correct volume ratio of gases in electrolysis of water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceIn an unknown reaction, an insoluble white solid forms, but no noticeable temperature change is observed. What is the most appropriate conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceA student adds zinc granules to a blue copper sulfate solution. After some time, the blue colour fades and a reddish-brown coating appears on the zinc. Which conclusion is correct?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceIn which situation is a substance considered to be reduced?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceIn a closed system, the total mass before and after a reaction remains the same, but the properties of the substances change. What is the correct conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceA student placed an iron nail in a blue copper sulphate solution. After some time, a reddish-brown coating formed on the nail and the solution began to turn green. What type of reaction is this?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceWhy should a colour change alone not be considered conclusive evidence of a chemical reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceWhat is the reaction called in which a more reactive metal displaces a less reactive metal from its salt solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceWhy is the conversion of milk into curd a chemical change?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceWhy does storing food in airtight containers reduce rancidity?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceWhich of the following chemical equations represents a combination reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceWhen lead nitrate is heated, a brown gas is evolved. Which equation correctly represents this thermal decomposition?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceWhen an aqueous solution of barium chloride is mixed with an aqueous solution of sodium sulphate, what visible change is observed?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceWhat do state symbols such as \((s)\), \((l)\), \((g)\), and \((aq)\) indicate in a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhy does the likelihood of rusting increase when the zinc coating in galvanisation is removed?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceA student places a clean iron nail in a blue copper sulphate solution. After some time, the solution turns green and a reddish-brown coating appears on the nail. What is the correct conclusion from this experiment?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhich of the following chemical equations represents a displacement reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium