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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।

ScienceSilver chloride turns grey when kept in sunlight. What is the correct reason?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhen lead nitrate is heated, brown fumes are evolved. Which gas causes these fumes, and what type of reaction is this?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhen water is added to calcium oxide, the container becomes hot. What does this indicate about the reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhich is the correct match for the white powder formed when a magnesium ribbon burns in air and the type of reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhich is the balanced chemical equation for the reaction in which hydrogen and oxygen form water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhich observation provides the best evidence that a chemical reaction has occurred in an experiment?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 7Easy ScienceA student wrote \(Mg + O_2 \rightarrow MgO\) for the burning of magnesium in oxygen and claimed that it is balanced. Which is the correct balanced equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 7Easy ScienceWhy is digestion of food considered a chemical change?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 7Easy ScienceWhat does a downward arrow show in a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 7Easy ScienceWhat does an upward arrow written with a product in a chemical equation indicate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 7Easy ScienceWhich symbol shows the gaseous state in a chemical equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 7Easy ScienceWhich of the following equations represents an exothermic reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 7Easy ScienceFall in temperature during a chemical reaction may indicate what?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 7Easy ScienceA rise in the temperature of the reaction mixture generally indicates what?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 7Easy ScienceWhy is a combustion reaction generally exothermic?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 7Easy ScienceIn a combustion reaction fuel generally burns in the presence of which gas?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 7Easy ScienceA clean iron nail is immersed in a blue copper sulphate solution for some time. Which observation is correct?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 7Easy ScienceWhat is the main purpose of filling chips packets with nitrogen gas?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 7Easy ScienceHow do antioxidants help prevent rancidity in food?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 7Easy ScienceWhat is the process called in which oils and fats develop an unpleasant taste and smell due to oxidation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 7Easy