Question

-------------  is a natural indicator.


Phenophthalein  

 Methyl orange  

Litmus 

Methyl red  ​

Answer 1

Explanation:

Phenolphthalein is a colourless liquid. It remains colourless with acid but turns into pink with a base. Methyl orange is originally orange in colour.

...

Indicator:

Indicator Red litmus

Original colour Red

Acid No change

Base Blue

Answer 2

Answer:

Litmus

Explanation:

Litmus is an indicator which is extracted from the lichens hence it is a natural indicator.

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