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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।

ScienceIf methyl orange is red and phenolphthalein is colourless, what should be added to neutralise the solution?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 14Medium ScienceIn which condition will phenolphthalein change from colourless to pink?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12Easy SciencePhenolphthalein is added to a colourless solution and it turns pink. On adding acid, the colour disappears. What does this show?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 11Medium ScienceMethyl orange appears red in acidic solution and yellow in basic solution. What is this property used for?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 11Easy ScienceA student passes dry hydrogen chloride gas separately over dry and moist blue indicator papers. Only the moist paper turns red. Which principle is proved?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Hard ScienceA colourless solution turns blue indicator paper red but produces no bubbles with carbonate. Which conclusion is most correct?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Hard ScienceMethyl orange is red and phenolphthalein is colourless in a solution. What should be added to neutralise it?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Easy ScienceWhy does methyl orange show different colours in acidic and basic media?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 8Medium SciencePhenolphthalein is pink in a basic solution. What does becoming colourless on adding acid indicate?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 8Medium ScienceSodium carbonate solution turns red indicator paper blue. What is the reason?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 8Medium ScienceWhat colour does methyl orange give in an acidic solution?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 15Easy ScienceHow does phenolphthalein appear in an acidic solution?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 15Easy ScienceA solution that turns red litmus blue is of which nature?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 15Easy ScienceA solution that turns blue litmus red is of which nature?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 15Easy SciencePhenolphthalein turns pink in sodium hydroxide. When hydrochloric acid is added slowly, when will the colour disappear?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 7Medium ScienceWhat is the colour of methyl orange indicator in an acidic solution?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 7Easy ScienceWhat effect does a basic solution have on red litmus paper?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 14Easy ScienceWhat effect does an acidic solution have on blue litmus paper?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 14Easy ScienceWhat is the colour of methyl orange in acidic solution and why is it useful?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 6Easy ScienceWhy does phenolphthalein turn pink in sodium carbonate solution?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 6Medium