Question

what are indicators?mention their types with examples​

Answer 1

Chemical Indicators

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Definition of Chemical Indicator

The chemical indicator is a substance that provides a clear sign or indication by a color change of the presence or absence of a threshold concentration of a chemical species such as an acid or base in a solution. An example is that the substance called methyl yellow which imparts a yellow color to an alkaline solution. If acid is slowly added the answer remains yellow until all the alkali has been neutralized whereupon the color suddenly changes to red.

Types of Indicators

Artificial, olfactory nd Natural indicators are the two types of Chemical indicators.

Artificial Indicators

• Litmus 
• phenolphthalein

Natural Indicators

• Turmeric
• China Rose

Olfactory indicators

• Onion
• Vanilla essence

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Answer 2

Answer:

An indicator is a substance that changes its color in acidic and basic medium. An indicator shows one color in an acidic medium and different colors in a basic medium so that they are called indicators. ... Indicators derived from natural sources are called natural indicators. eg:- Litmus, red cabbage.

Explanation:

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