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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।

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 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 ScienceMetal A displaces metal B from an aqueous solution of its salt, and metal B displaces metal C from an aqueous solution of its salt. Which metal is the most reactive?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceZinc displaces copper from a copper sulphate solution, but copper does not displace zinc from a zinc sulphate solution. What conclusion can be drawn about the reactivity of zinc and copper?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 ScienceWhen an iron nail is placed in copper sulphate solution, its mass may increase slightly. What is the most appropriate reason?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 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 ScienceWhen silver chloride is kept in sunlight, it turns grey. Which form of energy is mainly responsible for this change?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceWhy is it incorrect to identify the brown fumes observed on heating lead nitrate as oxygen?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 ScienceWhen water is added to calcium oxide, calcium hydroxide is formed and a large amount of heat is released. What type of reaction is this?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceIn the burning reaction of magnesium, the coefficient of the oxygen molecule displaystyle \(\mathrm{O_2}\) is 1. What will be the coefficient of magnesium displaystyle \(\mathrm{Mg}\) in the balanced equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceIn the balanced reaction in which hydrogen and oxygen form water, if there are two water molecules on the product side, how many hydrogen molecules are required on the reactant side?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceIn an unbalanced equation, oxygen atoms are fewer on the right side. What is the most correct method during balancing?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Easy ScienceDuring an unknown process in a closed container, the properties of a substance changed, a new substance was formed, and the total mass remained unchanged. What is the most appropriate conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhich option correctly states the position of reactants and products in a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Easy ScienceIf a colour change is observed in a process, can it be identified conclusively as a chemical reaction on this basis alone?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard