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Question

The oxidation state of N in NH4NO3 is


A

+2

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B

+1

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C

-3

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D

+5

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Solution

The correct options are
C

-3


D

+5


Oxidation number of N in NH4NO3

If we go by the usual method N2H4O3;2X+4×(+1)+3×(2)=0

2X+43=0 or X=+1 (wrong)

No doubt N2H4O3 has two Nitrogen atoms. One N has negative oxidation number (attached to H) and the other has positive oxidation number (attached to O). Hence the evolution should be made separately for NH+4 and NO3.

For the oxidation number of N in ammonium ion, NH+4: x+4×(+1)=+1 or x=3

For NO3 x+3×(2)=1 or x=+5


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