Multiple choice

Which of the following statements matches with xanthoprotic reaction?

  1. The 10% solution of sodium hydroxide added in protein with copper sulphate solution colour should change to reddish violet.

  2. Conc. nitric acid added in protein yellow colour obtained.

  3. The protein are added in millon reagent followed by heating red precipitate.

  4. Addition of ninhydrin in proteins gives blue colour.

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct because the treatment with conc. nitric acid, in certain protein, gives yellow colure. This yellow colour is the same as that formed on the skin.

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