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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।

ScienceIn a chemical equation, what do a downward arrow \(\downarrow\) and an upward arrow \(\uparrow\) written with products respectively indicate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard ScienceIf gas evolves in an unknown reaction but colour does not change what will be the most careful conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceIn which situation should a colour change not be considered evidence of a chemical reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard ScienceOn what basis can the formation of curd from milk and the formation of ice from water be differentiated?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard ScienceOn what basis are chewing food and digesting it different?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard ScienceWhen a clean iron nail is placed in a blue \(CuSO_4\) solution, a reddish-brown coating forms on the nail. Which conclusion correctly explains this change?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard ScienceWhy are both combustion and respiration considered exothermic processes?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard ScienceWhen a single compound breaks down into two or more simpler products on heating, what type of reaction is it?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceIf heat is written along with the products in a chemical equation and light is also emitted during the reaction, what is the nature of the reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard ScienceIf a container becomes very cold during a reaction, what is the most suitable explanation of the energy change?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceWhat common effect do antioxidants and airtight packaging have?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard ScienceDuring electrolysis of acidified water, 15 mL of oxygen is collected at the anode. A student says that 15 mL of hydrogen will also be produced at the cathode because water contains both H and O. What is the correct correction to the student's statement?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard ScienceWhy does exposed iron remain protected from rusting for some time even when the zinc coating in galvanisation is scratched?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard ScienceA student states that the reaction \(\mathrm{AgNO_3(aq)+NaCl(aq)\rightarrow AgCl(s)+NaNO_3(aq)}\) is both a precipitation reaction and a redox reaction. What is the correct evaluation of this statement?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard ScienceWhich of the following reactions is not an oxidation-reduction (redox) reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard ScienceWhich pair shows oxidation first and reduction second?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Easy ScienceIn a chemical reaction, oxygen is removed from substance A and the same oxygen is added to substance B. What is the most appropriate classification of this reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceIf copper oxide becomes copper in the reaction with hydrogen, what change has occurred?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Easy ScienceWhy is the reaction between barium chloride and sodium sulphate classified as both a double-displacement and a precipitation reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Hard ScienceWhen a precipitation reaction occurs on mixing two aqueous solutions, what is its clearest visible evidence?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Easy