Search questions
Choose which content to search, then combine terms with AND or OR.
Class 10 · Science · Easy
→Why can acid rain damage marble buildings?
Class 10 · Science · Medium
→A farmer's soil has pH 8.5. He wants to reduce its basicity. Which method would be more suitable?
Class 10 · Science · Medium
→In a solution phenolphthalein is colourless but methyl orange is yellow. What type of solution could it be?
Class 10 · Science · Easy
→When water is added to plaster of Paris, into which substance does it harden?
Class 10 · Science · Medium
→Why can the effectiveness of bleaching powder decrease when it is kept exposed to air for a long time?
Class 10 · Science · Medium
→What is the correct order of gases formed at the anode and cathode in the chlor-alkali process?
Class 10 · Science · Medium
→What is the main chemical difference between washing soda and baking soda?
Class 10 · Science · Medium
→Why does the blue colour return when water is added after heating blue copper sulphate crystals?
Class 10 · Science · Medium
→In an experiment with dry ammonia gas and moist red litmus paper, why can the litmus turn blue?
Class 10 · Science · Medium
→If dilute acid is added to both sodium carbonate and sodium hydrogen carbonate, which test will give the same result?
Class 10 · Science · Hard
→A salt solution turns blue litmus red. From what type of acid and base could this salt be formed?
Class 10 · Science · Medium
→What will be the approximate pH of the final solution in complete neutralisation of a strong acid and a strong base?
Class 10 · Science · Medium
→Why may food taste bitter if baking powder does not contain an acidic component along with baking soda?
Class 10 · Science · Medium
→An acidic solution is diluted with a large amount of water. Which conclusion is most scientific?
Class 10 · Science · Medium
→A dilute acid gives gas with a metal, but the same acid generally gives no gas with copper. What is the main reason?
Class 10 · Science · Medium
→Why can sodium hydrogen carbonate be considered a useful antacid in excess acidity?
Class 10 · Science · Hard
→If the pH of a basic solution decreases from 13 to 10, what happens to its basicity?
Class 10 · Science · Medium
→A student takes equal amounts of two acids. The first ionises completely and the second ionises partially. Which is more likely to have a lower pH?
Class 10 · Science · Hard
→An unknown solution turns red litmus blue and forms a white precipitate when carbon dioxide is passed through it. Which substance is most likely present in the solution?
Class 9 · General Knowledge · Medium
→