Question

How many types of indicators???
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Answer 1

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An indicator is a die that changes colour when it is put in an acid or a base .

An indicator helps to identify acids and bases by giving different colours .

The for most common use indicators are :

1. blue or red litmus paper
2. phenolphthalein
3. methyl orange
4. universal indicator

There is one more common type of indicator names as olfactory indicators . The term olfactory means the relative to the sense of smell .

Answer 2

Answer:

there are two types of indicator

1. natural indicator

2. artificial indicator