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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।

ScienceIn which of the following reactions does the same element undergo both oxidation and reduction simultaneously?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceWhen copper(II) oxide is heated with hydrogen, copper is formed. Which process occurs to copper(II) oxide in this reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceWhich of the following equations represents a displacement reaction in which oxidation and reduction occur simultaneously?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceTwo aqueous solutions are mixed and a white insoluble solid and sodium chloride are formed. What could be the original solutions?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceMetal 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 least reactive?Class 10Chemical Substances – Nature and BehaviourMetals and Non-metalsLevel 4MediumScienceWhy does a reddish-brown coating form on an iron nail and the solution turn green when the nail is placed in copper sulphate solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceDuring the electrolysis of water, at the same temperature and pressure, if the volume of hydrogen gas obtained is 20 mL, what will be the volume of oxygen gas?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceWhat is the most suitable reason for storing silver bromide in a dark-coloured bottle?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceSilver chloride turns grey in sunlight. This change is related to which energy and which product?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceWhich is the correct pair of solid residue and brown gas formed on heating lead nitrate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceWhich solid product is formed on thermal decomposition of calcium carbonate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceThe gas evolved on heating calcium carbonate turns lime water milky. Which gaseous product does this confirm?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceIn the reaction of calcium oxide with water, only one product is formed and heat is released. What is the correct combined classification of this reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceWhy is it incorrect to change the subscripts in the formula of a compound while balancing a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceIn the balanced equation for burning magnesium, \(2\mathrm{Mg}+\mathrm{O}_2\rightarrow2\mathrm{MgO}\), how many oxygen atoms are present on the product side?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceIf a gas is produced during a chemical reaction, what precaution should be taken while verifying the law of conservation of mass?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceIn a closed container, a total of 20 g of reactants undergo a reaction to form products, and any gas produced remains inside the container. What will be the total mass of the products?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceIn which situation will checking conservation of mass be most reliable?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceWhich of the following reactions is both a displacement reaction and a redox reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceWhat is the correct difference between the aqueous symbol \((aq)\) and the liquid symbol \((l)\) in a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard

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