Violet colour is obtained when dilute `CuSO_4` is added in alkaline solution of protein. This test is known as

Violet colour is obtained when dilute CuSO4 is added in alkaline solution of protein. This test is known as

Colour developed when a drop of aqueous CuSO_(4) is added to alkaline solution of protein is

When CuSO_4 is added to a solution of ammonia

When CuSO_4 is added to a solution of ammonia

NH_4OH is added to aqueous solution of CuSO_4 .

A violet colour is obtained on adding Cl_(2) water in solution of potassium halide in presence of chloroform and on adding excess of Cl_(2) water, violet colour disappears and colourless solution appears. The test shows the presence of