MHT CET · Chemistry · Biomolecules
White precipitate is formed in
- A Millon's test
- B ninhydrin test
- C biuret test
- D xanthoprotic test
Answer & Solution
Correct Answer
(A) Millon's test
Step-by-step Solution
Detailed explanation
In Millon's test, first the compound (to be tested) ie, protein is nitrated by \(\mathrm{HNO}_{3}\) and then complexed with \(\mathrm{Hg}(\mathrm{I})\) and \(\mathrm{Hg}(\mathrm{II})\) ions. A red precipitate is obtained. However, if the protein contains tyrosine, sometimes initially a white precipitate is formed that turns red on heating.
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