Protein solution gives violet coloured complex on reaction with

Iodine

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Copper sulfate

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Ninhydrin

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None of the above

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Solution

The correct option is B Copper sulfate
Biuret test is a chemical assay that detects the presence of proteins in a given sample. This test detects a color change to confirm the presence of proteins. If proteins are present in the sample, its color will turn violet. Biuret reagent is an alkaline mixture of potassium hydroxide and copper sulfate. The normal color of biuret reagent is blue. The reagent turns violet in the presence of peptide bond. Thus the correct answer is option B.

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Similar questions

C l^{-}

	Formula	Colour	$C l^{-}$ ions in solution per formula unit
(A)	$C r C l_{3} .6 H_{2} O$	violet	3
(B)	$C r C l_{3} .6 H_{2} O$	light green	2
(C)	$C r C l_{3}^{'} 6 H_{2} O$	dark green	1

H_{2} S_{(g)}

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