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Q.

NO2− and NO3− can be distinguished by which of the following reagent?

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a

Dil. H2SO4

b

Devarda's alloy+ cone. NaOH

c

None of the above

d

Conc. H2SO4

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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