Q. Oxidation number of $N$ in $H N O_{3}$ is:

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A

+3.5

B

-3.5

C

+5

D

-5

Solution:

Suppose the oxidation number of $N$ in $H N O_{3}$ is $x$ .
$1 + x + 3 (- 2) = 0$
or $x = + 5$