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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।

ScienceMetal A is less reactive than metal B. What will happen when metal A is placed in the salt solution of metal B?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceFading of blue colour of copper sulphate solution is linked with decrease of which ion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhat mainly increases when a small amount of acid is added during the electrolysis of water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceAt which electrode is the gas with lower volume formed during electrolysis of water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceIn the electrolysis of water, if the volume of oxygen produced is 15 mL, what will be the volume of hydrogen produced under the same conditions?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceWhat is the most correct reason for keeping silver salts in dark-coloured bottles?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceWhich product is mainly responsible for silver chloride turning grey on exposure to light?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhen silver chloride is exposed to light, its colour changes from white to grey. This is an example of which type of decomposition reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhich yellow solid residue is formed on thermal decomposition of lead nitrate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhich pair correctly identifies the brown gas and the colourless gas produced when lead nitrate is heated?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhen the gas evolved during thermal decomposition of calcium carbonate is passed through lime water, it turns milky. Which gas does this confirm?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhich solid and gas are formed when calcium carbonate is heated?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhich product is formed when water is added to calcium oxide?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhy is a magnesium ribbon cleaned by rubbing it with sandpaper before burning?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceHow many atoms are present in total in two water molecules?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceIf iron atoms are equal but oxygen atoms are not equal in an equation, what is the equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceWhile balancing a chemical equation, why should the subscripts in chemical formulae not be changed?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhat is the deepest reason for keeping atoms of all elements equal on both sides of a balanced chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceAfter a reaction in an open container, the measured mass appears lower because a gas produced has escaped. What is the correct scientific explanation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4HardScienceIn a closed container, a chemical reaction produces a gas and the temperature rises, but no matter escapes. What is the correct conclusion about the total mass of the container and its contents before and after the reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Expert