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प्रश्न
Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are ______.
पर्याय
red and blue.
blue and red.
pink and colourless.
colourless and pink.
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उत्तर
Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are colourless and pink.
Explanation:
Phenolphthalein remains colourless in acidic solution and turns pink in basic solution.
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| Solution | Change in Indicator | Acid/Base | ||
| Litmus | Phenolphthalein | Methyl orange | ||
| 1. | -- | No change | -- | |
| 2. | -- | -- | Orange colour turns red | |
| 3. | Red litmus turns blue | -- | -- | |
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