Which of the following oxoacids of nitrogen has most acidic character?
$I . N_{2} O_{3} I I . N O_{2} I I I . N_{2} O_{5} I V . N O$

I I

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I I I

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I V

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I

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Solution

The correct option is C $I I I$
Acidic character in oxoacids of nitrogen increases as oxygen per number of nitrogen increases (as oxidation state of a cation is directly proportional to its acidity).
The correct trend is $N_{2} O_{5} > N O_{2} > N_{2} O_{3} > N O$

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