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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
→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 10 · Science · Medium
→A student says all salts are neutral. Which answer correctly evaluates this statement?
Class 10 · Science · Medium
→Why can acid rain water be harmful for aquatic organisms?
Class 10 · Science · Medium
→A dilute acid is added to a white solid, producing a gas that turns lime water milky. What could the white solid be?
Class 10 · Science · Medium
→If pH is less than 7 but not very close to zero, what is the most balanced conclusion about the solution?
Class 10 · Science · Medium
→Why is sodium carbonate used to soften hard water?
Class 10 · Science · Easy
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