Why oxidation number of N in hydrazine is -2?

Answer 1

oxidation no. for each H is +1. the net charge on the hydrazine is 0

2N+4H=0

2N + 4(+1) = 0

2 N + 4 = 0

2 N = -4

N = -2

Answer 2

In hydrazine (N2H4), the oxidation number of N is -2 because hydrogen (H) is more electronegative than nitrogen (N), so each hydrogen contributes +1 to the overall charge of the molecule. Since hydrazine is a neutral molecule, the two nitrogen atoms must have an oxidation number of -2 each to balance the charges.