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Class10

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

ScienceWhy does silver chloride turn grey in sunlight?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1ExpertScienceWhy is it incorrect to identify the brown gas evolved on heating lead nitrate as oxygen?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1ExpertScienceWhat is the solid residue in the thermal decomposition of lead nitrate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1MediumScienceThe appearance of brown gas on heating lead nitrate identifies which gas?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1MediumScienceWhen water is added to calcium oxide, one product forms and heat is released. What is the correct combined identification?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1MediumScienceWhy is it incorrect to change the subscripts in a chemical formula while balancing a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1ExpertScienceWhat is the correct difference between the symbols (aq) and (l) in a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5HardScienceWhen copper(II) oxide is heated with hydrogen gas, what change occurs in the copper(II) oxide?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5HardScienceWhy does a precipitate form when aqueous barium chloride reacts with aqueous sodium sulphate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5HardScienceWhen two aqueous solutions are mixed, white insoluble barium sulphate and sodium chloride are formed. Which pair of original solutions could have been used?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5HardScienceWhy are combustion and respiration placed in the same category on the basis of energy change?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceIf heat is written on the products side of a chemical equation, what type of reaction does it represent?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceWhich is the correct pair of solid residue and brown gas formed on heating lead nitrate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceWhy are both combustion and respiration considered exothermic processes?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceIf 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 3HardScienceIf 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 3MediumScienceWhat common effect do antioxidants and airtight packaging have?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceWhy will rancidity increase quickly in ghee kept in a warm open place?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceWhat is the main chemical cause of rancidity in oily food?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3EasyScienceWhy 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