- Messages
- 195
- Reaction score
- 265
- Points
- 73
Remember: Oxygen always has oxidation state -2 and hydrogen +1 (except metal hydrides e.g.NaH). Every uncombined element has zero oxidation number
A: Nitrogen has +3 oxidation number in NH3 which reduces to -2 in NO. The change is 5.
B: Oxidation number of nitrogen is +4 in NO2 and +5 in HNO3 as in the NO3- ion Oxygen has total of -6 so the ion has -1. The change is 1.
C: +2 in NO and +4 in NO2. Change is 2.
D: -3 in NH3 and +2 in NO.Zero in N2. Biggest change is 3.
Hence the greatest change is in A (5).
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