Search questions
Use text search or combine filters to find exactly the questions you need.
Class 10 · Science
→A substance dissolves in water, turns red litmus blue, and gives carbon dioxide with acid. Which substance could it be?
Class 10 · Science
→Which two factors can reduce the quality of sodium hydroxide when it is kept in open air?
Class 10 · Science
→If phenolphthalein is added to an acidic solution and then a base is added slowly, when will the pink colour appear?
Class 10 · Science
→When gypsum is heated under controlled conditions, plaster of Paris is formed. How does the water content change?
Class 10 · Science
→What is one important use of the gas formed at the anode in the chlor-alkali process?
Class 10 · Science
→Washing soda crystals become powdery when kept in open air. This is related to which phenomenon?
Class 10 · Science
→Why does hydrochloric acid have a lower pH than ethanoic acid at the same concentration?
Class 10 · Science
→A gas first turns lime water milky and removes the milkiness when passed in excess. Which soluble substance forms in excess?
Class 10 · Science
→A salt solution turns blue litmus red. From which type of acid and base is it most likely formed?
Class 10 · Science
→A solution has pH 3. If the hydrogen-ion concentration becomes one hundred times lower, what will be the approximate new pH?
Class 10 · Science
→An unknown solution turns blue litmus red and gives a gas with zinc. When sodium carbonate is added to the same solution, another gas is released. What is the correct identification of both gases?
Class 10 · Science
→A question suggests using only taste to identify acids, bases, and salts. What is the most correct response from an exam point of view?
Class 10 · Science
→An indicator shows red in acidic solution and yellow in basic solution. Which indicator could it be?
Class 10 · Science
→A student says carbon dioxide is only a gas, so it has no relation with acids and bases. What is the correct correction?
Class 10 · Science
→Universal indicator gives blue colour in a solution. After adding acid, the colour becomes green. What does this mean?
Class 10 · Science
→A salt formed by an acid-base reaction gives an acidic solution. What does this indicate about the parent substances?
Class 10 · Science
→An aqueous solution of a substance shows pH 13. Why is it unsafe to touch it directly?
Class 10 · Science
→If blue litmus turns red in a solution and bubbles form when carbonate is added, which conclusion is correct?
Class 10 · Science
→Which pair is not correct?
Class 10 · Science
→