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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 which of the following reactions do oxidation and reduction occur simultaneously?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhat is the correct difference between the symbols [aq] and [l] in a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceA student calls the reaction \(2AgCl(s) \xrightarrow{\text{sunlight}} 2Ag(s)+Cl_2(g)\) a displacement reaction because chlorine is released. What is the best correction of the student's error?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhich of the following equations is a correct example of a precipitation reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceIf heat is shown on the reactant side of a chemical equation and one compound breaks down to form two or more products, what is the correct classification of the reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceA student classified the reaction \(2AgCl \xrightarrow{\text{sunlight}} 2Ag + Cl_2\) as a displacement reaction. What is its correct classification?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceA student places a zinc strip in a blue copper sulphate solution and claims that no chemical reaction has occurred. Which observation would prove the student's conclusion wrong?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhen an iron nail is placed in 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 3Expert ScienceWhich of the following equations represents a displacement reaction in which a more reactive metal displaces a less reactive metal from its aqueous salt solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhy does an oiled iron object rust less?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceIn galvanisation, the zinc coating mainly prevents iron from coming into contact with which of the following?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhy are oxidation and reduction considered together in a redox reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhat type of reaction is represented by \(2Pb(NO_3)_2 \xrightarrow{\Delta} 2PbO + 4NO_2 + O_2\)?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceIn the thermite reaction \(Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe\), which substance is oxidised and which is reduced?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhen black copper(II) oxide, \(\mathrm{CuO}\), is heated with hydrogen gas, reddish-brown copper is formed. This change is an example of what?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhat is the correct set of products when barium chloride and sodium sulphate solutions are mixed?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceIf metal A displaces metal B from an aqueous solution of its salt, but metal B does not displace metal A from a solution of its salt, which metal is more reactive?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhen an iron nail is immersed in a blue copper sulphate solution, the blue colour fades. This is mainly due to which ionic change?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhy does copper deposit on the surface of an iron nail placed in copper sulphate solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceWhy can the solution turn green when an iron nail is placed in copper sulphate solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert