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    Question

    Sequential chemical changes that occur during

    submergence and puddling in rice are given below. Which of the following is not occur due to given condition?
    A Oxidation of Fe+2 to Fe+3 Correct Answer Incorrect Answer
    B Reduction of Mn+4 to Mn+2 Correct Answer Incorrect Answer
    C Decrease in the concentration of water soluble Zn & Cu Correct Answer Incorrect Answer
    D Reduction of NO3 and NO2 to N2 and N2O Correct Answer Incorrect Answer
    E Increase in the supply of availability of N Correct Answer Incorrect Answer

    Solution

    Reduction of ferric (Fe+3) to Ferrous (Fe+2)

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