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Class 10 Science

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

ScienceWhich of the following is a chemical change but not a precipitation reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceIf gas evolves in an unknown reaction but colour does not change what is the most careful conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhy should a chemical reaction not be confirmed carelessly from colour change alone?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhich statement identifies a reaction as a displacement reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceHow is chewing food different from digesting it?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 is reduced?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhen an iron nail is placed in a blue copper sulphate solution, the solution turns green and a reddish-brown coating forms on the nail. What type of reaction is this?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceIn the reaction \(2\mathrm{FeCl_3} + \mathrm{SnCl_2} \rightarrow 2\mathrm{FeCl_2} + \mathrm{SnCl_4}\), which substance is the reducing agent?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhen a zinc strip is placed in a blue copper sulphate solution, which observation indicates a displacement reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceA student states that the reaction \(2\mathrm{Mg}+\mathrm{O}_2\rightarrow2\mathrm{MgO}\) is not a displacement reaction because no element replaces another element from a compound. The student is correct because this reaction is which type of reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhy does oily food kept in warm, open air spoil quickly?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceA student places an iron nail in a blue copper sulphate solution. After some time, a reddish-brown coating appears on the nail and the solution turns light green. What type of reaction is this?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard SciencePainting and oiling prevent rusting based on which common principle?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhich of the following is a double displacement reaction that forms a precipitate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceIn the reaction between copper(II) oxide and hydrogen, the formation of water indicates the oxidation of which substance?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 ScienceWhich correctly identifies oxidation and reduction in the following reaction? \(\mathrm{Zn + CuSO_4 \rightarrow ZnSO_4 + Cu}\)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 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