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Exercise 21 - NCERT
(a) Biuret test • Take 2 mL of protein solution (milk, albumin of egg or gram seed extract) in a test tube. • Add 1 mL of 40% NaOH solution and 1 or 2 drops of 1% CuSO 4 solution. • A violet colour indicates the presence of proteins. Care must be taken that excess of copper sulphate is not added otherwise
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