Q. A protein solution on warming with concentrated nitric acid may turn yellow called

A
xanthoproteic test
B
biuret test
C
Millions test
D
Hopkins cole test
Solution:

The xanthoproteic reaction is a method that can be used to determine the amount of protein soluble in a solution, using concentrated nitric acid. The test gives a positive result in amino acids carrying aromatic groups, especially in the presence of tyrosine.

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