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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।

ScienceWhich substance is displaced when an iron nail is placed in copper sulphate solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceWhich pair of products is formed when an iron nail is placed in copper sulphate solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceWhat is the volume ratio of hydrogen to oxygen gases produced during the electrolysis of water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceWhich gas is produced at the anode during the electrolysis of acidified water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceWhy are silver salts such as silver chloride and silver bromide mainly used in photography?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceWhat is the main reason that white silver chloride turns grey during its photolytic decomposition?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceOn thermal decomposition of lead nitrate, which solid product is formed besides gases?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceWhat is the identity of the brown gas formed on heating lead nitrate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceWhy is the reaction between calcium oxide and water that forms calcium hydroxide called a combination reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceWhich energy change occurs when calcium oxide reacts with water to form calcium hydroxide?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceIn the balanced chemical equation for the formation of water from hydrogen and oxygen, how many water molecules are on the product side?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceIn the balanced chemical equation for burning magnesium, \(2\mathrm{Mg}+\mathrm{O}_2\rightarrow2\mathrm{MgO}\), how many magnesium atoms are on the reactant side?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceWhy must subscripts in chemical formulae not be changed while balancing a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceBefore balancing a chemical equation, what should be checked first?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceIn an unknown reaction, the colour changes, heat is released, and a gas forms. What is the most suitable conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2MediumScienceWhich of the following involves only a physical change?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2MediumScienceIn which experiment does the volume ratio of the gases obtained indicate the composition of water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2MediumScienceIn which example are both gas evolution and a colour change observed as signs of a chemical reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2MediumScienceIf heat is written on the reactant side of a chemical equation, what type of reaction is it?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2MediumScienceIf heat is written on the product side of a chemical equation, what type of reaction is it?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium

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