Which of the following is/are external indicators?

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Phenolphthalein

Methyl orange

Diphenylamine

All of these.

answer is D.

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Detailed Solution

Concept- The external indicators are those indicators that are added externally to the chemical reaction and do not act as reactants. Whereas the use of the external indicators is avoided due to its decreased volume of the reaction mixture.
External Pointers are which are added from outside and detect the change in pH etc.
eg: In Acid-base titrations, Phenolphthalein and Methyl Orange are added
Emulsion which is an outgrowth of aniline, and the organic emulsion Diphenylamine, conforming to an amine bound to two phenyl groups which are used as a redox index.
Hence, Phenolphthalein, Methyl orange, and Diphenylamine are external indicators.
Hence, the correct option is 4.

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