Question
Harmful substance present in Urea
isSolution
Urea when heated to a temperature above 140 -170 , form biuret by joining of two urea molecules                          2CO(NH2)2  NH2CONHCONH2 + NH3 In urea biuret should not be >1.5 % (as per Fertilizer Control Order of Government of India) Biuret content should not exceed >0.25 % for foliar spray
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