Oxidation number of nitrogen in given species

1. A.
   $\mathrm{NH_4NO_3}$
2. B.
   $\mathrm{N_2H_4}$
3. C.
   $\mathrm{N_3H}$
4. D.
   $\mathrm{NH_2CONH_2}$

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1. A.
   $+3,\ -3$
2. B.
   $-3,\ +4$
3. C.
   $-4,\ +3$
4. D.
   $+5,\ +3$

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