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Oxidation

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

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 ScienceWhy is burning of magnesium both a combination reaction and an oxidation reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceWhy is a magnesium ribbon cleaned by rubbing it with sandpaper before burning?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Expert ScienceWhich chemical process do antioxidants slow down in food?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium 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 ScienceWhy can burning of magnesium be considered both combination and oxidation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceWhy does removing the layer formed on the surface of a magnesium ribbon make its burning clearer?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhy is respiration considered a slow and controlled energy-releasing process compared with combustion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Expert ScienceWhich problem do antioxidants and airtight packing both reduce?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Easy ScienceWhy do foods containing oils and fats remain unspoiled for longer when packed in nitrogen-filled packets?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Expert ScienceWhich statement about oxidation and reduction is correct?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Expert ScienceWhy is a magnesium ribbon cleaned with sandpaper before burning?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Expert ScienceWhat is the common purpose of antioxidants and airtight packing in food?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert ScienceWhy do chips remain fresh for a longer time in a nitrogen-filled packet?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert ScienceWhat is the main chemical cause of oils and fats becoming rancid and developing a bad smell?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert ScienceWhich two conditions are necessary for rusting of iron?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium 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 ScienceIn terms of oxygen, which correctly identifies oxidation and reduction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert