Question

what is the substance not used as indicator?​

Answer 1

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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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Answer 2

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chemical are useful in chemistry to identify a complete reaction.....

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