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KVPY Sample Paper KVPY Stream-SX Model Paper-1

  • question_answer
    Protein on reaction with which yields Ruhemann's purple?

    A) Ninhydrin                      

    B) \[C{{u}^{2+}}\]

    C) \[{{H}_{2}}{{O}_{2}}\]                      

    D) Benedict's solution

    Correct Answer: A

    Solution :

    [a] Ninhydrin is most commonly used to detect fingerprints. In fingerprint the terminal Amines of lysine residues in peptides and Proteins sloughed off and react with Ninhydrin. When reacting with these free Amines, a deep blue or purple colour (known as Ruhemann's purple) is produced.


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