Class 7th Science Written Work Ch 5 Acids, Bases and Salts
1. State differences between acids and bases. Solution: Acids Bases Acids are sour in taste Bases are bitter in taste Acids turn blue litmus paper into red color The base does not change the colour of blue litmus paper Acids does not change the colour of the red litmus Bases turn red litmus paper to blue color Acids do not change the colour of turmeric Bases turn turmeric to red 2. Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature? Solution: The answer is basic in nature 3. Name the source from which litmus solution is obtained. What is the use of this solution? Solution: Litmus solution is extracted from lichens. Litmus solution is used as an indicator to find acidic and basic nature of a solution. 4. Is the distilled water acidic/basic/neutral? How would you verify it? Solution: Distilled water is neutral in nature, and this can be tested by using red and blue litmus paper. In either of the cases, colour remains uncha
