General Tests
(i) When heated with sodium hydroxide, ammonia is evolved.
(ii) When heated gently, it forms biuret which gives violet colouration with sodium hydroxide and a drop of copper sulphate solution.
(iii) Its aqueous solution with concentrated nitric acid gives a white precipitate.
(iv) On adding sodium nitrite solution and dil. HCl (i.e., HNO2) to urea solution, nitrogen gas is evolved and gives effervescence due to carbon dioxide.
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