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Chemical Equations

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

ScienceIn the 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 3ExpertScienceWhen white silver chloride g( gCl) is exposed to sunlight, it turns grey. Which product is responsible for this colour change?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3ExpertScienceA student places a zinc strip in a blue copper sulphate solution and says that the blue colour fades because copper is more reactive than zinc. Which correction to this statement is correct?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3ExpertScienceIf the number of atoms of any one element is not the same on the reactant and product sides of a chemical equation, what is the equation called?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3ExpertScienceWhy is it safer to change coefficients rather than subscripts when balancing a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3ExpertScienceWhat is the correct distinction between the symbols  ext{(aq)} and  ext{(l)} in a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2ExpertScienceWhat is the correct respective meaning of upward arrow and downward arrow?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2EasyScienceWhy cannot a chemical reaction be confirmed on the basis of colour change alone?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2ExpertScienceIn a chemical equation, heat energy is written on the reactant side, and one compound breaks down to form two or more products. What type of reaction is this?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2ExpertScienceIf a container becomes cold during a process and gas is observed evolving, what is the most cautious conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2ExpertScienceWhich of the following equation represents a reaction that is both a combination reaction and an exothermic reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2ExpertScienceWhich symbol is used in a chemical equation to show the formation of an insoluble solid in a precipitation reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2ExpertScienceA student wrote \(\mathrm{Fe + H_2O \rightarrow FeO + H_2}\) for the reaction of iron with steam. What is the main error in this equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2ExpertScienceWhich is the correct pair of solid and gaseous products formed when calcium carbonate is heated?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2ExpertScienceWhy is the burning of magnesium considered a combination reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2ExpertScienceIn two formula units of magnesium oxide, what is the ratio of magnesium atoms to oxygen atoms?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2ExpertScienceHow many oxygen atoms are required to form two water molecules?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2ExpertScienceIf a chemical equation has the same number of hydrogen atoms on both sides but an unequal number of oxygen atoms, what is the correct conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2ExpertScienceWhy are coefficients, rather than subscripts, changed when balancing a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2ExpertScienceIn a chemical equation, what do a downward arrow and an upward arrow respectively indicate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Easy