what is indicator and it's properties
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Chemical indicator, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution.....
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indicator is a solution which is use to check the nature of a chemical or object it is made from china rose( gudhal)
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