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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।

ScienceA student heated 12.0 g of calcium carbonate in an open crucible and obtained 6.7 g of solid. Which evaluation is correct?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceHow are products predicted in a double displacement reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhy does a precipitate form when aqueous barium chloride reacts with aqueous sodium sulphate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhen two aqueous solutions are mixed, white insoluble barium sulphate and sodium chloride are formed. Which pair of original solutions could have been used?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceMetal A displaces metal B and metal B displaces metal C from their salt solutions. Which is least reactive?Class 10Metals and Non-metalsReactivity seriesLevel 5Medium ScienceZinc displaces copper from an aqueous solution of its salt, but copper does not displace zinc from an aqueous solution of its salt. What is the most correct conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceIn the thermite reaction \(Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe\), which substance acts as the reducing agent?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhen an iron nail is placed in copper sulphate solution, which substance is deposited on the surface of the nail?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhich problem is solved by adding a small amount of acid during electrolysis of water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceDuring electrolysis of water, at the same temperature and pressure, if the volume of oxygen collected is 7 mL, what volume of hydrogen will be collected?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhat is the scientific reason for storing silver bromide in a dark-coloured bottle?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhen silver chloride is exposed to sunlight, it turns grey. What is the main reason for this colour change?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhy is it incorrect to identify the brown fumes evolved on heating lead nitrate as oxygen?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhen lead nitrate is heated, a solid residue and a brown gas are formed. Which pair is correct?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhen water is added to calcium oxide, calcium hydroxide is formed and heat is released. What type of reaction is this?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhen a single compound breaks down into two or more simpler substances on heating, what type of reaction is it?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Easy ScienceIn the reaction of magnesium with oxygen, if 2 formula units of magnesium oxide are formed, how many \(\mathrm{O_2}\) molecules are needed to balance the equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceIf the product side of a balanced chemical equation contains two water molecules, \(2\mathrm{H_2O}\), what total number of hydrogen atoms must be present on the reactant side?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhat happens if the subscripts in the chemical formula of a compound are changed while balancing a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceLimestone, \(\mathrm{CaCO_3}\), is heated in a sealed container and decomposes into calcium oxide and carbon dioxide. If the carbon dioxide does not escape, what is the correct conclusion about the total mass of substances before and after the reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard