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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।

ScienceWhat is the main difference between a skeletal equation and a balanced equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5ExpertScienceWhich statement best explains the scientific need for a balanced chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5MediumScienceWhy can a lower measured mass after gas escapes from an open container give a wrong conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5HardScienceIn a closed container, gas and a precipitate both form during a reaction, but nothing escapes. What is the correct conclusion about mass?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5MediumScienceIn an unknown process a new substance formed gas evolved and total mass remained same in a closed container. What is the most suitable conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhat is the correct difference in direction of energy between photosynthesis and respiration?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhy is respiration considered different from combustion yet an energy releasing chemical process?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhen an iron nail is placed in a blue copper sulphate solution, the solution gradually 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 4ExpertScienceIf heat is written on the product side and the container is hot what is the correct conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceIf a container becomes cold and gas also evolves what is the most careful conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceHow does a nitrogen filled packet protect oily food?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhat is the most correct reason why oily food kept in warm open air spoils quickly?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhat is the basic chemical cause of rancidity of oils and fats?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhat is the main reason why an oiled iron object rusts less?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhy can rusting start when the paint layer on iron is scratched?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhich pair is most essential for rusting of iron?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceWhy are oxidation and reduction understood together in a redox reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceA student claims that in the reaction 2Mg + O₂ → 2MgO, magnesium is reduced because it combines with oxygen. What is the correct evaluation of this claim?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4MediumScienceWhy is hydrogen oxidised in the reaction between copper oxide and hydrogen?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4ExpertScienceFormation of white solid barium sulphate shows which dual identification?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Expert