Question

Arrange in increasing order of valency of Nitrogen in HNO3 , HNO2 , NO2.

Answer 1

NO2....HNO2....HNO3...

I GUESS THIS IS CORECT

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Answer 2

The given compounds valency of nitrogen in the increasing order is as follows.

    $HNO_{2}$ < $NO_{2}$ < $HNO_{3}$

Explanation:

Valency is the ability of an atom to combine with number of electrons in order to attain noble gas electronic configuration. Or, more is the oxidation state of an atom more will be its tendency to combine with more number of electrons of another atom.

Oxidation state of nitrogen in $NO_{2}$ is as follows.

                   x + 2(-2) = 0

                   x = +4

Oxidation state of nitrogen in $HNO_{2}$ is as follows.

                1 + x + 2(-2) = 0

                   x = +3

Oxidation state of nitrogen in $HNO_{3}$ is as follows.

                1 + x + 3(-2) = 0

                  x = +5

Therefore, in the given compounds valency of nitrogen in the increasing order is as follows.

           $HNO_{2}$ < $NO_{2}$ < $HNO_{3}$

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