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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 solution turns blue litmus red but keeps phenolphthalein colourless. Which conclusion is correct?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Medium ScienceTurmeric turns reddish-brown in a solution. What property does this solution have?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Easy ScienceWhy does aqueous sodium chloride conduct electricity even though it is neutral?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Medium ScienceIf the pH of the mouth falls below 5, what situation develops for the teeth?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Medium ScienceWhat is the role of acid in damaging tooth enamel?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Medium ScienceWhy does food become spongy when baking soda and an acid are mixed?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Medium ScienceWhy is controlled heating necessary to make plaster of Paris from gypsum?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Hard ScienceA solution has pH 9. Acid is added and the pH becomes 7. What reaction has occurred?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Easy ScienceAcid rain lowers the pH of a lake. Why can this seriously affect aquatic organisms?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Medium ScienceWhich experiment gives the most direct evidence for the presence of ions in an acidic solution?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Medium ScienceA salt solution turns red litmus blue. It may be formed from which type of acid and base?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Medium ScienceIf a base solution turns phenolphthalein pink, when will the pink colour disappear on adding acid?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Medium ScienceWhich substance is most suitable to reduce the acid present in an ant sting?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Easy ScienceWhich solid substance is formed when sodium hydrogen carbonate is heated?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Easy ScienceBlue copper sulphate gives a white substance on heating. Its colour returns when water is added. What does this prove?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Medium ScienceA student says a concentrated acid and a strong acid are the same. What is the correct evaluation?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Medium ScienceWhich statement about bleaching powder is most correct?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Hard ScienceIf equal amounts of water are repeatedly added to an acidic solution, what change is expected?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Hard ScienceWhich option correctly gives an example of a strong acid and a weak acid?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Hard ScienceWhich is the correct group of three main products formed in the chlor-alkali process?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 9Hard