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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 substance gives carbon dioxide with acid and forms a basic solution in water. Which substance is most suitable?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 11Medium ScienceWhy can sodium hydroxide pellets become wet and then less pure in open air?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 11Hard SciencePhenolphthalein is colourless and methyl orange is red in a solution. What is the nature of this solution?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 11Medium ScienceGypsum forms plaster of Paris on controlled heating. Why is excessive heating a problem?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 11Hard ScienceBy which test can the gas formed at the cathode in the chlor-alkali process be identified?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 11Medium ScienceA gas turns moist blue litmus red but has no effect on dry blue litmus. What does this prove?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 11Medium ScienceWhich is the safe method for mixing acid with water?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 11Medium ScienceIf an acid is less electrically conducting than another acid of the same concentration, what is the most appropriate conclusion?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 11Hard ScienceAn acid is added to a white solid and a gas evolves that turns lime water milky. Excess of the same gas removes the milkiness. What is the final soluble substance?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 11Hard ScienceAn unknown salt solution shows pH 8.5 and turns red litmus blue. What type of salt is it most likely to be?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 11Medium ScienceAn acidic solution has pH 4. If it is made one thousand times less acidic, what will be the approximate new pH?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 11Hard ScienceIn an experiment, solution A turns blue litmus red and solution B turns red litmus blue. When mixed in suitable amounts, the temperature rises slightly. This proves which reaction?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 11Medium ScienceA student says acids only turn blue litmus red and show no other chemical property. Which response is correct?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceIf a salt is formed by mixing an acid and a base, when is its aqueous nature most likely to be neutral?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceWhat is the correct scientific reason for avoiding storage of curd in copper or brass vessels?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceIf blue litmus turns red in a solution and its pH is 2, what changed when adding water makes the pH 4?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceWhat is the similarity in the reaction of carbonates and hydrogen carbonates with acids?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceA student says every base dissolves in water. What is the correct correction?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Medium ScienceAdding acid to a solution gives no carbon dioxide, but adding zinc gives hydrogen. What nature could the solution already have?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Hard ScienceWhich pair correctly matches the chemical name and common name?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 10Easy