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    Question

    Harmful substance present in Urea

    is
    A Biuret Correct Answer Incorrect Answer
    B Uric acid Correct Answer Incorrect Answer
    C Amide Correct Answer Incorrect Answer
    D Cyanide Correct Answer Incorrect Answer

    Solution

    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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