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
B Reduction of Mn+4 to Mn+2
C Decrease in the concentration of water soluble Zn & Cu
D Reduction of NO3 and NO2 to N2 and N2O
E Increase in the supply of availability of N
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