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Question

Select the correct decreasing order of the oxidation state of nitrogen in the following options:


Your Answer
A
HNO3,NO,NH4Cl,N2
Correct Answer
B
HNO3,NO,N2,NH4Cl
Your Answer
C
HNO3,NH4Cl,NO,N2
Your Answer
D
NO,HNO3,NH4Cl,N2

Solution

The correct option is C HNO3,NO,N2,NH4Cl
Oxidation state of Nitrogen in different compounds is as follows:
Assume Nitrogen has O.S of x.
In HNO3 
O.S of H is +1 and O is -2
equating: +1 +x + 3*(-2) = 0 
So x = +5
In NO,
x + (-2) = 0: x = +2
In N2, being a neutral molecule it has 0 oxidation state
In NH4Cl
x + 4*(+1) + (-1) = 0
hence x = -3
Order in decreasing O.S is 
HNO3>NO>N2>NH4Cl
 

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