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Redox Reactions

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

ScienceWhat is the general meaning of reduction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Easy ScienceWhat is the general meaning of oxidation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Easy ScienceIf substance A loses oxygen and substance B loses hydrogen which processes occur respectively?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Expert ScienceWhy are oxidation and reduction understood together in a redox reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceA student claims that in the reaction 2Mg + O₂ → 2MgO, magnesium is reduced because it combines with oxygen. What is the correct evaluation of this claim?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceWhy is hydrogen oxidised in the reaction between copper oxide and hydrogen?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Expert ScienceIn which of the following reactions does an element in the same substance undergo both oxidation and reduction simultaneously?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Hard ScienceIn which of the following reactions do oxidation and reduction occur simultaneously?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhich of the following is a redox reaction in which the oxidation number of one element increases and that of another element decreases?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhen black copper(II) oxide, \(\mathrm{CuO}\), is heated with hydrogen gas, reddish-brown copper is formed. This change is an example of what?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhat is the correct order of gases produced at the anode and cathode during the electrolysis of water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceIn the reaction \(\mathrm{CuO + H_2 \rightarrow Cu + H_2O}\), which of the following statement is correct?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhen black copper(II) oxide is heated with hydrogen gas, it changes into reddish-brown copper. This change is primarily evidence of which process?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Expert ScienceIn the reaction \(\mathrm{CuO + H_2 \rightarrow Cu + H_2O}\), which substance is reduced?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Expert ScienceThe white colour of silver chloride turning grey in light is evidence of what?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Expert ScienceIn terms of oxygen, which correctly identifies oxidation and reduction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert ScienceFormation of water in the reaction of copper oxide and hydrogen proves oxidation of which substance?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert ScienceWhen copper(II) oxide is heated with hydrogen gas, copper is formed. Which process occurs to copper(II) oxide in this reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert ScienceIn the thermite reaction \(Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe\), which substance is reduced?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhat is the correct order of the processes in which hydrogen is removed from a substance and then added to a substance?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium