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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।

SciencePhenolphthalein turns pink in an aqueous solution of sodium carbonate. What is the most appropriate reason?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13HardScienceWhen water is added to calcium oxide, a large amount of heat is released and calcium hydroxide is formed. What is the correct classification of this reaction?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13MediumScienceAn acidic solution has pH 2 and another acidic solution has pH 5. How many times higher is the hydrogen ion concentration in the first solution?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13HardScienceA solution turns red litmus blue. When ammonium chloride is added to it and heated, a pungent-smelling gas is evolved. Which gas is it?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13HardScienceWhen excess carbon dioxide gas is passed through sodium hydroxide solution, what can finally be the main product?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13HardScienceDry hydrogen chloride gas is passed over dry blue litmus paper and no colour change occurs. The same gas is passed over moist blue litmus paper and it turns red. What is the reason?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13HardScienceDilute sulphuric acid is added to zinc pieces in a test tube. The evolved gas burns with a pop sound near a burning splint. What is the correct chemical reason?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13MediumScienceA farmer has highly acidic soil and wants to reduce its acidity without harming crop roots. Which substance is most suitable?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13MediumScienceAn unknown salt gives brown fumes on heating and leaves a yellow solid that turns white on cooling. Which salt does this indicate?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13HardScienceA student adds phenolphthalein to a colourless solution and observes a pink colour. Then dilute hydrochloric acid is added slowly and the pink colour disappears. Which conclusion is most correct?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 13MediumScienceA student added an acidic substance to already acidic soil. What effect is likely on plant growth?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12MediumScienceWhy is it not suitable to leave sodium hydroxide open in air?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12MediumScienceAn unknown sample reacts with acid to give a gas that turns lime water milky. Which class could the sample belong to?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12MediumScienceA solution turns red litmus blue and phenolphthalein pink. Which could it be?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12EasyScienceA solution turns blue litmus red but keeps phenolphthalein colourless. What is the nature of the solution?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12EasyScienceIf both magnesium and zinc react with dilute acid, which gas will be common in both reactions?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12EasyScienceWhat products are generally formed in the reaction between a metal and an acid?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12EasyScienceIn which reaction can salt, water, and carbon dioxide all be formed?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12MediumScienceWhy can a solution of sodium hydrogen carbonate be applied on a bee sting?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12MediumScienceWhy is baking soda useful for reducing irritation from an ant sting?Class 10Chemical Substances – Nature and BehaviourAcids, Bases, and SaltsLevel 12Medium