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Chemical Equations

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

ScienceIf heat is written on the product side of a chemical equation, what does it mean?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Easy 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 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 ScienceWhy is the volume of hydrogen collected at the cathode approximately twice the volume of oxygen collected at the anode during electrolysis of 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 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 ScienceA student writes the reaction of steam with red-hot iron as \(Fe + H_2O \to FeO + H_2\). Which option correctly corrects the error?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhich of the following is a decomposition reaction but not a photolytic decomposition reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceIf bubbles form during an experiment, what is the most careful conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceHow does a balanced equation show conservation of mass?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhy is it wrong to change subscripts while balancing an equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhat is the correct reason for considering photosynthesis a chemical reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceA student calls the reaction \(Fe + CuSO_4 \rightarrow FeSO_4 + Cu\) a double displacement reaction. What is the correct correction to the statement?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhich of the following equations represents a displacement reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhy does silver chloride turn grey when kept in sunlight?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhich solid product is formed on thermal decomposition of lead nitrate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceIf two reactants combine to form only one product and heat is released, what is the correct classification of the reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceA student burnt a magnesium ribbon in air and obtained a white powder. Which is the correct conclusion about the powder and the reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium