Which of the following are not natural indicators?

Turmeric

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Litmus

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Phenolphthalein

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Methyl orange

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Solution

The correct options are
C Phenolphthalein
D Methyl orange
Indicators prepared from natural substances are known as natural indicators. For examples, oleander, litmus, turmeric, beetroot, etc.
Phenolphthalein and methyl orange are not natural indicators as they are prepared artificially from chemicals. Hence, these two are synthetic indicators.

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