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Chemical Substances Nature And Behaviour

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

ScienceIn the reaction CuO + H₂ → Cu + H₂O, water is formed. What does this show about hydrogen?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceMetal A displaces metal B from its salt, and metal B does not displace metal A. What is the correct conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Easy ScienceWhich reaction is an example of a double displacement reaction in which a precipitate is formed?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhen an iron nail is placed in copper sulphate solution, a reddish-brown coating forms on the nail and the solution turns green. What is the correct reason?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhat is the main difference between electrolytic decomposition and thermal decomposition?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Easy ScienceWhen lead nitrate is heated, it decomposes to form lead oxide, nitrogen dioxide, and oxygen. Which gas is brown in colour?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceWhich white precipitate forms when barium chloride and sodium sulphate solutions are mixed?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhat is the solid residue in the thermal decomposition of lead nitrate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceThe appearance of brown gas on heating lead nitrate identifies which gas?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceWhen 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 1Medium ScienceHow many hydrogen atoms are present in two water molecules?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Easy ScienceWhat is the main reason for keeping atoms of every element equal on both sides of a balanced equation?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Easy ScienceIn an experiment, copper powder forms black CuO when heated in air. When H2 is passed over it on heating, reddish-brown copper is obtained again. Which is the correct explanation of these changes?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Hard ScienceWhat is the correct order of the processes in which hydrogen is removed from a substance and then added to a substance?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceHow are products predicted in a double displacement reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhich problem is solved by adding a small amount of acid during electrolysis of water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceWhat is the microscopic reason for fading of blue colour of copper sulphate solution?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Hard ScienceWhat is the real purpose of adding a small amount of acid during electrolysis of water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceA student heated calcium carbonate in an open test tube. The mass of the solid decreased after heating, so the student concluded that the law of conservation of mass is incorrect. What is the correct correction to this conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Hard ScienceSilver chloride turns grey in sunlight. This change is related to which energy and which product?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium