a.NO2
b.oN+2(b.oO)=0
b.oN+2(-2)=0
b.oN+(-4)=0
b.oN=4
b.
c.NH4
b.oN+4(b.oH)=0
b.oN+4(+1)=0
b.oN+4=0
b.oN=-4
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a.NO2
b.oN+2(b.oO)=0
b.oN+2(-2)=0
b.oN+(-4)=0
b.oN=4
b.
c.NH4
b.oN+4(b.oH)=0
b.oN+4(+1)=0
b.oN+4=0
b.oN=-4