Observation of 'Rhumann's purple' is a confirmatory test for the presence of:

starch

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reducing sugar

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protein

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cupric ion

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Solution

The correct option is C protein

Ninhydrin (2,2-dihydroxyindane-1,3-dione) is a chemical used to detect ammonia or primary and secondary amines. When reacting with these free amines (proteins), a deep blue or purple color known as Ruhemann's purple is produced.

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Observation of “Rhumann’s purple” is a confirmatory test for the presence of:

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