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White precipitate is formed in...

White precipitate is formed in

A

Million's test

B

ninhydrin test

C

biuret test

D

xanthoprotic test

Text Solution

Verified by Experts

The correct Answer is:
A
In Millon's test , first the compound ( to be tested ) ie , protein is nitrated by `HNO_(3)` and then complxed with `Hg(I) and Hg(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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