Search questions
Choose which content to search, then combine terms with AND or OR.
Class 10 · Science · Hard
→A basic solution changes from pH 13 to pH 10. Approximately how did its basicity change?
Class 10 · Science · Medium
→Why does pH increase when hydroxide ions are added to an acidic solution?
Class 10 · Science · Medium
→On heating baking soda, the aqueous solution of the remaining solid is basic. What is the name of the remaining solid?
Class 10 · Science · Medium
→Acid rain affects marble mainly because of which substance in marble?
Class 10 · Science · Medium
→Why is aqueous sodium chloride electrically conducting even though it is neutral?
Class 10 · Science · Easy
→Below which pH range is the risk of tooth enamel dissolving considered higher?
Class 10 · Science · Medium
→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 · Medium
→What are the two main reasons for sodium hydroxide becoming wet and less pure in open air?
Class 10 · Science · Medium
→Methyl orange is red and phenolphthalein is colourless in a solution. Which substance is suitable to neutralise it?
Class 10 · Science · Medium
→Gypsum forms plaster of Paris on controlled heating. What problem can occur on excessive heating?
Class 10 · Science · Medium
→Which gas is formed at the cathode in the chlor-alkali process and how is it identified?
Class 10 · Science · Medium
→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 · Easy
→Why is it considered safe to add acid slowly into water during dilution?
Class 10 · Science · Medium
→Two acids have the same concentration. The first acid shows higher electrical conductivity. Which conclusion is more correct?
Class 10 · Science · Medium
→A gas turns lime water milky and in excess removes the milkiness. This gas is most likely formed from what?
Class 10 · Science · Hard
→A salt solution shows pH 10. From which type of acid and base is it more likely formed?
Class 10 · Science · Hard
→The pH of a solution changes from 2 to 5. What happens to the hydrogen ion concentration?
Class 10 · Science · Medium
→A solution turns blue litmus red but the same substance in dry form has no effect on litmus. What is the most appropriate reason?
Class 10 · Science · Easy
→Why is it not correct to identify a colourless solution as acid or base only by looking at it?
Class 10 · Science · Medium
→