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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।

ScienceThe temperature rises slightly when sodium hydroxide is added to an acidic solution. What is the reason?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceWhy does baking powder not react vigorously in dry state even though it contains baking soda and an acidic substance?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Hard ScienceMethyl orange is red in a solution, but it becomes yellow when base is added slowly. What does this show?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceA student says carbon dioxide is not an acid, so it cannot react with a base. What is the correct evaluation?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceLime is added to an acidic lake and the pH of water increases. Which process is this an example of?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceFrom the pH point of view, why is cleaning the mouth after meals useful for teeth?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceWhen hard water is mixed with aqueous washing soda, hardness decreases. What is the main reason?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceIf one metal gives no gas with an acid and another metal gives gas rapidly with the same acid, what is the correct basis of comparison?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceAmmonium chloride solution can turn blue litmus red. What is the most appropriate reason?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceIf hydrogen ions are much more numerous than hydroxide ions in a solution, which colour is more likely with universal indicator?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Easy ScienceWhen gypsum is heated at a controlled temperature, how much water remains in the product formed?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceAn unknown solid gives water droplets and changes colour on heating. Its colour returns after adding water. This indicates the presence of what?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceWhich statement correctly explains the difference between a strong base and a concentrated base?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceWhy does the risk of splashing increase when an acid is mixed with water very quickly?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceWhy is the membrane considered important in the chlor-alkali process?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Hard ScienceA sample gives carbon dioxide with acid and its aqueous solution turns red litmus blue. Which substance is most likely?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceAn aqueous solution of a salt turns red litmus blue. From which pair is this salt more likely to be formed?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceIf the pH of a basic solution changes from 12 to 9, which statement about the effect of hydroxide ions is most correct?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Hard ScienceA student passes dry hydrogen chloride over dry blue litmus and observes no change. The same gas turns moist blue litmus red. What is the correct reason?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Hard ScienceTwo solutions have pH values 2 and 6 respectively. How much greater is the hydrogen ion concentration in the first solution than in the second?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Hard