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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।

ScienceTurmeric turns reddish-brown and red litmus turns blue in a solution. Which ion is likely to be in excess?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13Easy ScienceIf equal volumes of acid and base are mixed but the solution remains acidic, which reason may be correct?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13Medium SciencePhenolphthalein is pink and methyl orange is yellow in a solution. What is the nature of the solution?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13Easy ScienceWhy can excessive heating of gypsum reduce the quality of plaster of Paris?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13Hard ScienceBaking powder produces carbon dioxide in moist dough but generally does not react strongly in a dry container. What is the best reason?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13Medium ScienceA blue crystalline salt becomes white on heating and turns blue again on adding water. What does this prove?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13Medium ScienceWhy can there be a problem in the chlor-alkali process if the products are not kept separate?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13Hard ScienceA solution turns red litmus blue and does not release carbon dioxide when acid is added. Which substance is most likely?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13Medium ScienceA dilute acid is added to a white solid and the gas turns lime water milky. If excess gas removes the milkiness, which sequence is correct?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13Medium ScienceAmong two acids of equal concentration, the first is a better conductor of electricity. Based on this, what can the first acid be like?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13Medium ScienceA salt solution shows pH 6 and turns blue litmus slightly red. From what may this salt be formed?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13Hard ScienceAn acidic solution has pH 2. If it is made ten thousand times less acidic, what will be the approximate new pH?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13Hard ScienceA solution gives red colour with universal indicator. After adding water the colour becomes yellow but not green. What is the correct conclusion?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13Medium ScienceA question says acids and bases should be identified only by colour. What is the most correct exam-based answer?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12Easy ScienceWhy does an acidic solution not immediately become basic when a large amount of water is added?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12Medium ScienceIn the manufacture of bleaching powder, chlorine is passed over which substance?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12Medium ScienceA substance forms salt and water with an acid but does not dissolve in water. What is it more correctly called?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12Medium ScienceIf blue litmus turns red and methyl orange turns red in a solution, which substance can neutralise it?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12Easy ScienceA student says carbonates give hydrogen gas with acids. What is the correct correction?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12Easy ScienceUniversal indicator is red in a solution. After adding water, the colour becomes orange. What does this show?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12Medium