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

ScienceWhat is the role of heat in thermal decomposition of calcium carbonate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceIn the balanced combustion reaction of magnesium, if \(2\mathrm{MgO}\) is written on the product side, how many magnesium atoms must be on the reactant side?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceIn the balanced chemical equation for the formation of water, if there are 2 water molecules on the product side, how many oxygen molecules 0( 0 ext{O}_2 0) 0 are required on the reactant side?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceWhile balancing a chemical equation, if a student changes a subscript in the formula of water, \(\mathrm{H_2O}\), what mistake has been made?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceWhich change is the clearest indication that a chemical reaction has occurred?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2HardScienceWhich statement correctly describes the difference between a skeletal chemical equation and a balanced chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2HardScienceWhich of the following correctly matches a state symbol with the state of a substance?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2EasyScienceIf an upward arrow ↑ is written after a product in a chemical equation, which observation does it indicate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2EasyScienceA product written with a downward arrow in a chemical equation will have which property?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2EasyScienceWhat does writing sunlight above the arrow in the following photosynthesis equation indicate? \(6CO_2 + 6H_2O \xrightarrow{\text{sunlight}} C_6H_{12}O_6 + 6O_2\)Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2HardScienceWhat type of reaction is represented by the following general equation? \[ A+B\rightarrow C+\text{heat} \]Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2HardScienceWhich of the following reactions involves both oxidation and reduction occurring simultaneously?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2MediumScienceIn the burning reaction of magnesium, the coefficient of the oxygen molecule displaystyle \(\mathrm{O_2}\) is 1. What will be the coefficient of magnesium displaystyle \(\mathrm{Mg}\) in the balanced equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2HardScienceIn the balanced reaction in which hydrogen and oxygen form water, if there are two water molecules on the product side, how many hydrogen molecules are required on the reactant side?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2HardScienceIn a chemical equation, in which situation is the symbol (aq) correctly used?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1EasyScienceWhich option gives the correct meaning of upward and downward arrows in a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1EasyScienceIf a colour change is observed in a process, can it be identified conclusively as a chemical reaction on this basis alone?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1HardScienceWhich of the following chemical equation represents a double displacement reaction in which a precipitate is formed?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1HardScienceWhich of the following reactions shows a more reactive metal displacing a less reactive metal from its aqueous salt solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1HardScienceIf heat is written with the reactants in a reaction, what is the correct meaning?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Easy