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Q.

 Substance Oxidation state of N
A)HNO3I)– 3, + 5
B)NH4NO3II)– 1/3
C)N3HIII)+ 5
D)H3PO3IV)+ 3
  V)+ 1/3
 (A)(B)(C)(D)
1)IIIIIIIV
2)VIIIIIIV
3)IIIIIIIV
4)IVIIIIIV

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a

1

b

2

c

3

d

4

answer is A.

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Detailed Solution

HNO3 ; (+1)+x+3(-2)=0 x=+5

NH4NO3 ;

 NH4+; x+4(+1)=+1 x=-3

NO3- ; x+3(-2)=-1x=+5

N3H ; 3x+(+1)=0 x=-1/3

H3PO3 ; 3(+1)+x+3(-2)=0x=+3

 

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