Which of the following is Not a redox reaction?
A. NH4NO3----> N2O+2H2O
B. NH3+HNO3---->NH4NO3
C. N2O4+H2O-----> HNO2+HNO3
D. 4HNO3-----> 2H2O+ 4NO2+O2
The answer is B
But why it is B??
The oxidation number increases from -3to+5 and decreases from +5to-3??
This is not a redox??
CE Chem past paper 2005 MC no.8(URGENT) 15points
2008-04-27 6:15 pm
回答 (2)
2008-04-28 2:17 am
✔ 最佳答案
傳統方法係計oxidation number~~but有個快D方法,所有neutralization都不是redox reaction,
因為NH3(ammonia) 係alkaline,HNO3(nitric acid)係acid~~
((相反所有displacement reaction都係redox reaction))
2008-04-27 18:18:59 補充：
剩係CE係咁,A LEVEL唔知,我都係會考生~
2008-04-27 7:13 pm
the oxidation numbers of H & O wont change in most cases
B. NH3 HNO3----NH4NO3
oxidation number of N in NH3 is -3
oxidation number of N in HNO3 is 5
oxidation number of N in NH4 ion in the product is -3
oxidation number of N in NO3- ion in the product is 5
you cannot say that the oxidation number of N changes from -3 to 5 or from 5 to 3 because NH4 is an ion formed from NH3, while NO3- is an ion formed from HNO3 hence no oxidation number change
B. NH3 HNO3----NH4NO3
oxidation number of N in NH3 is -3
oxidation number of N in HNO3 is 5
oxidation number of N in NH4 ion in the product is -3
oxidation number of N in NO3- ion in the product is 5
you cannot say that the oxidation number of N changes from -3 to 5 or from 5 to 3 because NH4 is an ion formed from NH3, while NO3- is an ion formed from HNO3 hence no oxidation number change
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