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Redox Reaction

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

ScienceWhy is hydrogen called oxidised in the reaction between copper oxide and hydrogen?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceHow is the reaction Zn + CuSO₄ → ZnSO₄ + Cu most accurately classified?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Hard ScienceWhen copper oxide is heated with hydrogen, the black substance becomes reddish brown. What does this prove?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceA student says that carbon dioxide extinguishes fire, so pouring CO₂ over a burning magnesium ribbon will put it out. Why is this statement incorrect?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Hard ScienceWhich statement about oxidation and reduction is correct in the given equation? \(2\mathrm{FeCl_3} + \mathrm{SnCl_2} \rightarrow 2\mathrm{FeCl_2} + \mathrm{SnCl_4}\)Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhich of the following equations represents a displacement reaction in which a more reactive metal displaces a less reactive metal from its aqueous salt solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceIn the thermite reaction Fe₂O₃ + 2Al → Al₂O₃ + 2Fe, which statement correctly identifies oxidation and reduction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard ScienceWhy are oxidation and reduction considered together in a redox reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceIn the thermite reaction \(Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe\), which substance is oxidised and which is reduced?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceIn the reaction \(Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe\), which substance acts as the reducing agent?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhich of the following reactions involves oxidation of one substance and reduction of another substance simultaneously?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Expert ScienceIn the reaction CuO + H₂ → Cu + H₂O, which statement is correct with respect to oxidation and reduction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhich statement about the reaction \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\) is correct?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert ScienceRemoval of hydrogen from a substance and addition of hydrogen to a substance indicate which processes, respectively?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceIf substance A loses oxygen and substance B gains that oxygen, which statement is correct?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceIn an experiment, copper powder forms black CuO when heated in air. When H2 is passed over it on heating, reddish-brown copper is obtained again. Which is the correct explanation of these changes?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceIn the reaction \(2\mathrm{FeCl_3} + \mathrm{SnCl_2} \rightarrow 2\mathrm{FeCl_2} + \mathrm{SnCl_4}\), which substance is the reducing agent?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceIn the thermite reaction \(Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe\), which substance acts as the reducing agent?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceIn the reaction \(CuO + H_2 \rightarrow Cu + H_2O\), which statement about oxidation and reduction is correct?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhich of the following reaction is an example of both a displacement reaction and a redox reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Hard