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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 effect do airtight packaging and filling a packet with nitrogen gas have on rancidity?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhy does rancidity increase when oily food is kept in open air?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhy does the likelihood of rusting increase when the zinc coating in galvanisation is removed?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhy does an iron object rust less when kept in an airtight, dry container?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhy is rusting of iron considered a chemical change?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Easy ScienceIf hydrogen is removed from a substance, which process is it generally considered to be?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Easy ScienceIf hydrogen is added to a substance, which process is it generally called?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceA student places a clean iron nail in a blue copper sulphate solution. After some time, the solution turns green and a reddish-brown coating appears on the nail. What is the correct conclusion from this experiment?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhich of the following chemical equations represents a displacement reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhen hydrogen gas is passed over heated copper(II) oxide, the black copper(II) oxide changes into reddish-brown copper. Which statement correctly describes this reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhich of the following reactions is an example of both a double displacement reaction and a precipitation reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhy is the reaction in which barium sulphate forms on mixing aqueous barium chloride and aqueous sodium sulphate called a precipitation reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhat visible change occurs when aqueous solutions of sodium sulphate and barium chloride are mixed?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceIf metal A displaces metal B from its salt solution, what is the correct conclusion about metal A?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhy does a reddish-brown layer form on an iron nail placed in copper sulphate solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhen an iron nail is placed in copper sulphate solution, which salt is mainly present in the green solution formed?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceDuring the electrolysis of water, which gas is obtained in a larger volume at the cathode?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhy are silver chloride and silver bromide stored in dark-coloured bottles?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhen a single compound breaks down into two or more simpler substances on heating, what is the reaction called?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhich statement is correct about the reaction between calcium oxide and water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium