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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।

ScienceWhen copper(II) oxide is heated with hydrogen gas, the black substance changes into a reddish-brown substance. What is the reddish-brown substance?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceWhich of the following reactions is both a double displacement reaction and a precipitation reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceWhich of the following equations represents a double displacement reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceWhy does a precipitate form when aqueous solutions of barium chloride and sodium sulphate are mixed?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceMetal A displaces metal B from a solution of B's salt, but metal B does not displace metal A from a solution of A's salt. What is the correct conclusion?Class 10Metals and Non-metalsReactivity seriesLevel 1Hard ScienceIf a copper strip is placed in an aqueous zinc sulphate solution and no visible change occurs, what is the correct reason?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceWhich new salt is formed when an iron nail is placed in copper sulphate solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceWhich of the following equations represents a decomposition reaction that occurs in the presence of light?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceWhat is the main reason for storing silver chloride in a dark-coloured bottle?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceSilver chloride turns grey in sunlight. Which substance is mainly responsible for this colour change?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceA student placed an iron nail in a blue copper sulphate solution. After some time, the solution turned light green and a reddish-brown coating appeared on the nail. Which type of reaction does this illustrate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceWhat is the role of heat in the reaction of heating lead nitrate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceWhich pair correctly identifies the brown gas and the solid residue formed on heating lead nitrate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceWhich is the correct set of products formed when calcium carbonate is heated?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceWhich statement best describes the reaction of calcium oxide with water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceIn a reaction, two reactants combine to form only one product, and the container becomes hot. What is the most appropriate classification of the reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceWhat problem occurs if subscripts are changed while balancing an equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceIn which situation will a chemical equation not be considered balanced?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceIn the balanced reaction for burning magnesium, if one molecule of oxygen ( ext{O}_2 ) is used, how many magnesium atoms are required?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard ScienceIn the equation \(2\mathrm{H}_2 + \mathrm{O}_2 \rightarrow ?\) for the formation of water, how many water molecules will be present on the product side?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Hard