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Chemical Reactions And Equations

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

ScienceHow many hydrogen atoms are present in two water molecules?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Easy ScienceWhat is the main reason for keeping atoms of every element equal on both sides of a balanced equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Easy ScienceIn an experiment, copper powder forms black CuO when heated in air. When H2 is passed over it on heating, reddish-brown copper is obtained again. Which is the correct explanation of these changes?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceUnder which condition will iron rust the most?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhat is the correct order of the processes in which hydrogen is removed from a substance and then added to a substance?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceHow are products predicted in a double displacement reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium 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 ScienceIn the reaction \(CuO + H_2 \rightarrow Cu + H_2O\), which statement about oxidation and reduction is correct?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 ScienceWhich of the following reaction is both a displacement reaction and a redox reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceWhich correctly identifies the oxidation and reduction changes in the reaction CuO + H₂ → Cu + H₂O?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceA student wrote the thermal decomposition of lead nitrate as Pb(NO₃)₂ → PbO + NO₂ + O₂ and claimed that it was balanced. Which change gives the correct balanced equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Hard ScienceA student heated copper powder in air. The reddish-brown copper turned black. Which statement about this change is correct?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Easy ScienceWhat is the main chemical process behind bad taste and smell of oils and fats?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Easy ScienceIf substance A loses oxygen and substance B gains that oxygen, what is the correct sequence of changes in substances A and B?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Easy ScienceWhen copper(II) oxide is heated with hydrogen, copper is formed. Which process occurs to copper(II) oxide in this reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceTwo aqueous solutions are mixed and a white insoluble solid and sodium chloride are formed. What could be the original solutions?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceWhat is the microscopic reason for fading of blue colour of copper sulphate solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Hard ScienceWhat is the real purpose of adding a small amount of acid during electrolysis of water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceA student heated calcium carbonate in an open test tube. The mass of the solid decreased after heating, so the student concluded that the law of conservation of mass is incorrect. What is the correct correction to this conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Hard