Answers

2016-03-15T20:25:25+05:30
3 is the valency of nitrogen in N2O3 
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  • Brainly User
2016-03-15T20:25:38+05:30
The key to this is twofold, the sum of the oxidation numbers for a compound will always be zero, and oxygen almost always has an oxidation number of -2. 

NO --- +2 
NO2 --- +4 
N2O --- +1 
N2O3 --- +3 
N2O5 ---- +5
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