| Test tube | Effect on blue litmus | Effect on red litmus | Effect on phenophthalein solution |
| A | Turns red | Colourless | Colourless |
| B | Remains blue | Turns blue | Pink colour |
| C | Remains blue | Remains red | Colourless |
Question
You are provided with three test tubes A, B and C as shown in figure with different liquids. What will you observe when you put (a) a piece of blue litmus paper in each test tube? (b) a piece of red litmus paper in each test tube? (c) a few drops of phenolphthalein solution to each test tube?
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Paheli observed that most of the fish in the pond of her village were gradually dying. She also observed that the waste of a factory in their village is flowing into the pond which probably caused the fish to die. (a) Explain why the fish were dying. (b) If the factory waste is acidic in nature, how can it be neutralised?
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