Identify oxidation number

Question

Identify the oxidation number of each atom involved. Determine which reaction atom was oxidized and which was reduced

2N4H4(g) N204 (g) ----> 3N2 4H20 (g)

Answer 1

Well, It is definately hard to answer...I think you need to check a website which provides substatial answer for this question.

http://www.extramarks.com

Thanks..

Answer 2

2N4H4(g) & N204 (g) ----> 3N2 &  4H20 (g)

N4H4 (H +1 each, N-1each)

N204 (O -2 each, N+4 each)

N2 (zero each)

H20 (H+1 each, O -2 each)

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the nitrogen in N2H4 was oxidized from -1 eah to zero each in N2

the nitrogen in N2O4 was reduced from +4 each to zero each in N2