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Class 10 · Science
→If the pH of the mouth falls below 5, what situation develops for the teeth?
Class 10 · Science
→What is the role of acid in damaging tooth enamel?
Class 10 · Science
→Why does food become spongy when baking soda and an acid are mixed?
Class 10 · Science
→Why is controlled heating necessary to make plaster of Paris from gypsum?
Class 10 · Science
→A solution has pH 9. Acid is added and the pH becomes 7. What reaction has occurred?
Class 10 · Science
→Acid rain lowers the pH of a lake. Why can this seriously affect aquatic organisms?
Class 10 · Science
→Which experiment gives the most direct evidence for the presence of ions in an acidic solution?
Class 10 · Science
→A salt solution turns red litmus blue. It may be formed from which type of acid and base?
Class 10 · Science
→If a base solution turns phenolphthalein pink, when will the pink colour disappear on adding acid?
Class 10 · Science
→Which substance is most suitable to reduce the acid present in an ant sting?
Class 10 · Science
→Which solid substance is formed when sodium hydrogen carbonate is heated?
Class 10 · Science
→Blue copper sulphate gives a white substance on heating. Its colour returns when water is added. What does this prove?
Class 10 · Science
→A student says a concentrated acid and a strong acid are the same. What is the correct evaluation?
Class 10 · Science
→Which statement about bleaching powder is most correct?
Class 10 · Science
→If equal amounts of water are repeatedly added to an acidic solution, what change is expected?
Class 10 · Science
→Which option correctly gives an example of a strong acid and a weak acid?
Class 10 · Science
→Which is the correct group of three main products formed in the chlor-alkali process?
Class 10 · Science
→Plaster of Paris loses its usefulness when kept open for a long time. What is the best reason?
Class 10 · Science
→Washing soda crystals become powdery when kept in open air. Which phenomenon does this illustrate?
Class 10 · Science
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