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

ScienceA student places a zinc strip in a blue copper sulphate solution and claims that no chemical reaction has occurred. Which observation would prove the student's conclusion wrong?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceA student places a clean iron nail in a blue copper sulphate solution. Which observation most clearly shows that a displacement reaction has occurred?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Expert ScienceIf a container becomes cold during a process and gas is observed evolving, what is the most cautious conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Expert ScienceIn an unknown chemical reaction, a gas was evolved and the container became cold. Which conclusion is the most cautious?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard ScienceIf the container becomes cold and a gas also evolves in a reaction, what is the most careful conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceIf, during a change, the colour changes, a gas is formed, and heat is released, what is the most appropriate conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 5Medium ScienceIf a substance appears to change colour but no other clear sign of a chemical change is observed, what should be done?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Medium ScienceWhy should a colour change alone not be considered conclusive evidence of a chemical reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3Medium ScienceIn an unknown reaction, the colour changes, heat is released, and a gas forms. What is the most suitable conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceDuring a chemical reaction, gas evolves and the container feels warm without external heating. What is the most appropriate conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Medium ScienceIn an experiment, bubbles formed and the container became cold. Which is the most cautious conclusion based on these observations?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceA student says that every colour change is a chemical reaction. What is the correct conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 1Medium ScienceIf bubbles are observed during a chemical reaction, what do they usually indicate?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 4Easy