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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।

ScienceWhy can combustion and respiration be considered similar on the basis of energy?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert ScienceIf heat is shown as a reactant on the left side of a chemical equation and one compound breaks down to form two or more products, what is the correct identification of the reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert ScienceIf the reaction vessel becomes very cold during a chemical reaction, what is the correct conclusion about the energy change?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert 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 ScienceA student observed that when an iron nail was placed in a blue copper sulphate solution, the solution gradually turned green and a reddish-brown coating formed on the nail. What type of reaction is this?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 ScienceWhy does iron remain protected from rusting for some time even when a small scratch develops in the zinc coating of galvanisation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert ScienceWhich common principle do painting and oiling use to prevent rusting?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert 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 ScienceWhy does the formation of barium sulphate on mixing aqueous solutions indicate a precipitation reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert ScienceWhy is the reaction between barium chloride and sodium sulphate called double displacement?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert ScienceMetal A displaces metal B from a solution of its salt, and metal B displaces metal C from a solution of its salt. Which metal is the most reactive?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert ScienceZinc displaces copper from its salt solution, but copper does not displace zinc from its salt solution. What is the correct conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert ScienceWhat is the ionic reason for fading of the blue colour of copper sulphate solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert ScienceWhy does a reddish-brown coating form on an iron nail placed in copper sulphate solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert ScienceDuring the electrolysis of water, if the volume of oxygen produced is 8 mL, what volume of hydrogen will be produced at the same temperature and pressure?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert ScienceWhat is the purpose of adding a small amount of dilute sulphuric acid during the electrolysis of water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Expert