chemistry(oxidation)

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ok,I really don't understand the whole oxidation numbers thing my question is state the oxidation number for nitrogen in the following

NH3= -3
NO2-1= -1
N2= 0
NO2Cl= 5
N2H4 -2
am I correct?


NH3= -3
NO2-1= -1 No, oxygen is -2, so N is +3
N2= 0
NO2Cl= 5
N2H4 -2

http://www.chemistry.co.nz/redox_oxi_aa.htm

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