${NO}_{2}^{-}$ and ${NO}_{3}^{-}$ can be distinguished by which of the following reagent?

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Dil. $H_{2} {SO}_{4}$

Devarda's alloy+ cone. $NaOH$

None of the above

Conc. $H_{2} {SO}_{4}$

answer is A.

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Detailed Solution

Nitrogen dioxide and nitrite contain the same molecular structure. The main distinction between nitrite and nitrogen dioxide is that nitrogen dioxide is a molecule, whereas nitrite is an anion. These properties help sulphuric acid distinguish between them.

Hence, the correct option is A.

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