Question

    Humic substance, which is most resistant to microbial attack is:

    A Fulvic acid Correct Answer Incorrect Answer
    B Humic acid Correct Answer Incorrect Answer
    C Humin Correct Answer Incorrect Answer
    D Both b & c Correct Answer Incorrect Answer
    E None of the above Correct Answer Incorrect Answer

    Solution

    Humin: Highest in molecular weight, darkest in colour, insoluble in both acid and alkali and most resistant to microbial attack. Polymerized product of a part of the FA and HA fractions.   

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