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Catalytic Hydrogenation

Find oxidatio...

Question

Find oxidation state of $N$ in $H N O_{3}$

A

+2

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B

-3

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C

+3

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D

+5

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Solution

The correct option is D
+5

Here,The oxidation number of N will not be +3 of -3 why? Let's check it out

Structure of $H N O_{3}$ is

O. N. of H = +1

O.N. of N = $(c o v a l e n t b o n d w i t h - O H) + (C o v a l e n t b o n d s w i t h O) + (c o o r d i n a t e c o v a l e n t b o n d w i t h O)$

= (+1 + (+2) + (+2) [Because N is less E.N. than O] = +5

Alternatively :

O. N. of H = +1

O.N. of O = - 2

$\Rightarrow$ (+1) +N +3 (-2) =0

$\Rightarrow$ n = 5

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