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Class 10 · Science
→Turmeric becomes reddish-brown and phenolphthalein becomes pink in a solution. What is the nature of the solution?
Class 10 · Science
→Copper oxide forms salt and water with acid. What nature of copper oxide is proved by this?
Class 10 · Science
→Why does copper metal generally not give hydrogen gas with dilute acids?
Class 10 · Science
→A basic solution changes from pH 13 to pH 10. Approximately how did its basicity change?
Class 10 · Science
→Why does pH increase when hydroxide ions are added to an acidic solution?
Class 10 · Science
→On heating baking soda, the aqueous solution of the remaining solid is basic. What is the name of the remaining solid?
Class 10 · Science
→Acid rain affects marble mainly because of which substance in marble?
Class 10 · Science
→Why is aqueous sodium chloride electrically conducting even though it is neutral?
Class 10 · Science
→Below which pH range is the risk of tooth enamel dissolving considered higher?
Class 10 · Science
→An unknown substance dissolves in water to give a basic solution and gives a gas with acid that turns lime water milky. Which substance could it be?
Class 10 · Science
→What are the two main reasons for sodium hydroxide becoming wet and less pure in open air?
Class 10 · Science
→Methyl orange is red and phenolphthalein is colourless in a solution. Which substance is suitable to neutralise it?
Class 10 · Science
→Gypsum forms plaster of Paris on controlled heating. What problem can occur on excessive heating?
Class 10 · Science
→Which gas is formed at the cathode in the chlor-alkali process and how is it identified?
Class 10 · Science
→A gas turns moist red litmus blue but has no effect on dry red litmus. What is the correct conclusion about the gas?
Class 10 · Science
→Why is it considered safe to add acid slowly into water during dilution?
Class 10 · Science
→Two acids have the same concentration. The first acid shows higher electrical conductivity. Which conclusion is more correct?
Class 10 · Science
→A gas turns lime water milky and in excess removes the milkiness. This gas is most likely formed from what?
Class 10 · Science
→A salt solution shows pH 10. From which type of acid and base is it more likely formed?
Class 10 · Science
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