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Chemical Reactions And Equations

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

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 4HardScienceIn the electrolysis of water, if the volume of oxygen produced is 15 mL, what will be the volume of hydrogen produced under the same conditions?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceWhat is the most correct reason for keeping silver salts in dark-coloured bottles?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceWhich gas is identified by brown fumes in the decomposition of lead nitrate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceOn what basis is the reaction of calcium oxide and water called an exothermic combination reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceWhy is burning of magnesium both a combination reaction and an oxidation reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceWhat will be the ratio of magnesium atoms to oxygen atoms in four formula units of magnesium oxide?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceIf iron atoms are equal but oxygen atoms are not equal in an equation, what is the equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceWhat is the deepest reason for keeping atoms of all elements equal on both sides of a balanced chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceAfter a reaction in an open container, the measured mass appears lower because a gas produced has escaped. What is the correct scientific explanation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceWhich chemical process do antioxidants slow down in food?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceWhy does an oiled iron object rust less?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceIn the thermite reaction Fe₂O₃ + 2Al → Al₂O₃ + 2Fe, which statement correctly identifies oxidation and reduction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceWhy is a precipitate shown by a downward arrow in an equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3EasyScienceWhy can burning of magnesium be considered both combination and oxidation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceWhat will be the ratio of magnesium atoms to oxygen atoms in three units of magnesium oxide?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3EasyScienceWhat is the total number of atoms in two water molecules?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3EasyScienceWhy is measuring less mass after gas escapes from an open container not against conservation of mass?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceIn a closed container a metal reacts with acid and gas forms but does not escape. What is the most suitable conclusion about total mass?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceWhat is the correct respective meaning of upward arrow and downward arrow?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Easy