Which of these is a natural indicator?
ACopper
BPetrol
CMarble
DLitmus
Answer & Solution
Correct answer: D. Litmus
1. An indicator changes colour in acids and bases.
2. Some indicators are taken straight from plants and lichens.
3. Turmeric, litmus and China rose petals are natural indicators.
4. So the answer is litmus.
_Source: NCERT Class 7 Science, Ch 4 'Acids, Bases and Salts'_
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