Which of the following 'indicators' is used to test the nature of solutions besides litmus paper?
Turmeric and red cabbage juice
Correct Answer: Turmeric and red cabbage juice
Natural substances that can act as acid-base indicators (change colour with pH):
- Turmeric: Yellow in neutral/acid; red/brown in base (becomes red with NaOH)
- Red cabbage juice: Contains anthocyanins; purple in neutral, red in acid, green/yellow in base
- China rose (Gudhal): Pink/dark pink in acid; green in base
- Litmus: Most common; red in acid, blue in base
Sand, sugar, salt, and alcohol are not indicators as they do not change colour with pH.
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