Exploring Substances: Acidic, Basic, and Neutral
Lemon tastes sour, soap feels slippery, and plain water seems neither, differences this chapter of the NCERT Curiosity textbook for Class 7 investigates. It introduces acids, bases, and neutral substances, and shows how indicators such as litmus, turmeric, and china rose reveal them through colour changes. Activities test kitchen and laboratory samples, explain neutralisation when acids and bases meet, and warn against tasting unknown chemicals while showing how antacids and similar products use this very idea.
Try a free lesson